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Linux Explained Simply
Linux is the best-known and most-used open source operating system. As an operating system, Linux is software that sits underneath all of the other software on a computer, receiving requests from those programs and relaying these requests to the computer’s hardware.
Linux is everywhere, even if you do not realize it. When you visit a website, watch a video online, use an Android smartphone, or access a cloud application, there is a good chance that Linux is involved somewhere in the technology making it work. But what exactly is Linux? Is it an operating system like Windows? Is it difficult to learn? And why do developers, system administrators, and technology companies use it? If you are new to Linux, this guide will help you understand what it is, how it works, where it is used, and how you can start learning it. You do not need previous Linux experience to follow this article. What Is Linux? Linux is a free and open-source operating system kernel. That definition might sound complicated, so let us explain it. An operating system is the software that allows you to interact with a computer and run applications. For example, when you turn on a Windows computer, the operating system manages the hardware and provides the environment where you can open a browser, edit documents, and install software. Linux performs the same general role when combined with other software to create a complete operating system. The important distinction is that Linux itself is technically a kernel, which is the central component of an operating system. A complete Linux operating system includes additional software such as system utilities, applications, and sometimes a graphical desktop. Most people simply call the complete system Linux. According to the official Linux kernel project, users who want a complete Linux system should install a Linux distribution rather than download the kernel alone. Source: The Linux Kernel Organization What Is the Linux Kernel? Think about what happens when you open a web browser. The browser needs memory to run. It needs processing power from your CPU, access to files, and a network connection to retrieve websites. The Linux kernel helps manage these resources. Its responsibilities include: Process management: Managing running programs and allocating processor time. Memory management: Allocating memory to applications and the operating system. Device management: Communicating with hardware through device drivers. File system management: Providing access to files and storage devices. Networking: Supporting communication between computers and networks. Without the kernel, applications would not have the standard operating system services they need to interact with the computer’s hardware. The kernel works in the background. Most users rarely interact with it directly. How Does Linux Work? A complete Linux system contains several components that work together. Here is a simplified view: This diagram is a simplified conceptual view. Applications can also communicate with the kernel directly through system calls. For beginners, the important point is that Linux provides the environment where applications can run and communicate with hardware. You do not need to understand every component before using Linux. You will become familiar with them as you gain experience. What Is a Linux Distribution? If Linux is a kernel, how do you install a complete Linux operating system? This is where Linux distributions come in. A Linux distribution, commonly called a distro, is a complete operating system built around the Linux kernel. A distribution includes the additional software needed to make Linux usable. Depending on the distribution, it may contain a desktop interface, software installation tools, system utilities, and preinstalled applications. Different distributions serve different purposes. Some focus on desktop users, while others target servers, development, security testing, or specialized hardware. Popular Linux Distributions Here are some distributions you will encounter as you explore Linux. Distribution Description Common Uses Ubuntu A distribution based on Debian with desktop and server editions. Desktop computers, servers, cloud environments, and development. Debian A community-developed distribution known for its emphasis on free software and stable releases. Servers, desktop computers, and development. Linux Mint A desktop-oriented distribution with a familiar graphical interface. Personal computers and everyday desktop use. Fedora A community distribution sponsored by Red Hat. Desktop computing, development, and learning newer Linux technologies. Rocky Linux An enterprise-oriented distribution designed for compatibility with Red Hat Enterprise Linux. Enterprise servers and hosting environments. AlmaLinux An enterprise Linux distribution developed by a community-supported foundation. Servers and enterprise infrastructure. All these distributions use the Linux kernel, but their software packages, default configurations, release schedules, and support models differ. For example, Ubuntu uses the APT package management system, while Fedora uses DNF. You will encounter these tools when you begin installing software. Which Linux Distribution Should Beginners Choose? If you are using Linux for the first time, Ubuntu Desktop or Linux Mint can provide an accessible starting point. Both provide graphical interfaces that let you perform everyday activities without immediately learning terminal commands. If your goal is to study Linux server administration, Ubuntu Server or Debian can help you become familiar with command-line management. You do not need to experiment with every distribution. Choose one that fits your learning goal and become comfortable using it. Linux vs. Windows vs. macOS Linux, Windows, and macOS are operating systems, but they differ in how they are developed, distributed, and managed. Feature Linux Windows macOS Developer Open-source community and organizations Microsoft Apple Source code Linux kernel is open source Mostly proprietary Combines proprietary and open-source components Hardware support Depends on distribution and drivers Broad PC hardware support Primarily Apple hardware Software installation Package managers and application installers Installers, Microsoft Store, and package managers App Store, installers, and package managers Customization Extensive options depending on distribution Customizable within supported settings Customizable within Apple’s system design Common uses Servers, desktops, cloud, embedded systems Desktops, business applications, gaming Desktops, creative work, and development Linux gives users substantial control over their operating system. However, this flexibility also means that some tasks may require additional technical knowledge. For example, certain Windows applications may not run natively on Linux. Hardware support and application availability should be checked before replacing an existing operating system. Where Is Linux Used? You might be surprised by how many technologies use Linux. It is used in personal computers, web hosting, cloud infrastructure, smartphones, and various electronic devices. Let us look at some practical examples. 1. Web Servers When you visit a website, your browser sends a request to a server. That server processes the request and sends the website content back to your device. Many web servers run Linux. Popular web server applications such as Nginx and Apache HTTP Server can run on Linux systems. For example, a Linux server running Nginx can receive an HTTPS request, retrieve website content, and deliver it to your browser. This is one reason Linux knowledge is useful for website administrators and developers. 2. Cloud Computing Cloud providers such as Amazon Web Services, Microsoft Azure, and Google Cloud offer Linux-based virtual machines. Businesses use these systems to host websites, databases, applications, and other services. For example, a developer can create an Ubuntu virtual machine in AWS, install Node.js, configure a database, and deploy a web application. The entire process can be managed remotely through a terminal. 3. Android Smartphones Android uses a Linux-based kernel. However, Android is not the same as a typical desktop Linux distribution. It has its own application framework, system services, and software environment designed for mobile devices. This is an example of how the Linux kernel can support operating systems with very different purposes. 4. Network Devices Some routers, firewalls, network appliances, and other embedded devices run Linux-based operating systems. Linux allows manufacturers to build specialized systems around their hardware. For example, OpenWrt is an open-source operating system designed primarily for embedded network devices. 5. Software Development Developers use Linux to write, test, build, and deploy software. Linux supports programming languages and development tools such as: Python JavaScript and Node.js PHP Java Go Rust Git Docker If you plan to become a web developer, system administrator, or DevOps engineer, Linux is worth learning. Is Linux Really Free? Yes, you can download and use many Linux distributions without paying a software license fee. The Linux kernel is distributed under the GNU General Public License version 2, commonly called GPLv2. This license allows people to use, study, modify, and redistribute the software, subject to its license conditions. However, there is an important distinction. Free and open-source software does not necessarily mean that every associated product or service is free of charge. For example, a company may provide commercial support, enterprise software subscriptions, cloud hosting, or professional services for a Linux-based system. You can install and operate many distributions without purchasing a license, but running a production server may still involve costs for hardware, hosting, maintenance, and support. You can learn more from the official Linux kernel licensing documentation. Is Linux Difficult to Learn? This depends on what you want to accomplish. If you want to browse websites, watch videos, edit documents, and perform everyday computer tasks, a desktop distribution can provide a familiar graphical experience. If you want to manage servers, configure networks, secure systems, or automate deployments, you will need to learn additional tools and concepts. The good news is that you can start with simple activities. You do not need to understand kernel development, networking, or advanced system administration before learning your first Linux command. Start with the basics. Learn how to navigate directories, inspect files, install software, and understand system information. As you become comfortable with these tasks, you can gradually study more advanced topics. Understanding the Linux Terminal One of the first things you will encounter while learning Linux is the terminal. The terminal provides a text-based interface where you can enter commands. Instead of clicking through menus, you can instruct the system to perform an action by typing a command. For example, on a typical Linux distribution with Bash, you can enter: pwd The command displays your current working directory. You might see: /home/pinoylinux This tells you that your current location is the /home/pinoylinux directory. Now try: ls The command lists the files and directories in your current location. You might see: Desktop Documents Downloads Pictures The terminal becomes particularly useful when managing remote servers that do not have a graphical desktop. In professional environments, system administrators often use SSH to connect to Linux servers and perform maintenance remotely. Your First Five Linux Commands If you already have access to a Linux machine, try the following commands. You can use an Ubuntu desktop, a Linux virtual machine, or a Linux environment provided by your school or workplace. These commands inspect information and do not modify your system. 1. Identify Your Linux Distribution Open the terminal and enter: cat /etc/os-release Example output: PRETTY_NAME="Ubuntu 24.04.3 LTS" NAME="Ubuntu" VERSION_ID="24.04" ID=ubuntu The exact values depend on your installed distribution and release. This command reads the operating system identification file. It is particularly useful when you are working on an unfamiliar server. 2. Check Your Linux Kernel Version Run: uname -r Example output: 6.8.0-79-generic The output displays the release identifier of the kernel currently running on your system. Your output will depend on the kernel installed and booted on your machine. 3. Find Your Current Directory Run: pwd Example output: /home/pinoylinux The command stands for print working directory. It tells you where you are in the file system. This is useful when navigating directories or working with files. 4. List Files and Directories Run: ls -la Example output: drwxr-xr-x 5 user user 4096 Sep 25 10:00 . drwxr-xr-x 3 root root 4096 Sep 25 09:00 .. -rw-r--r-- 1 user user 220 Sep 25 09:00 .bash_logout -rw-r--r-- 1 user user 3771 Sep 25 09:00 .bashrc drwxr-xr-x 2 user user 4096 Sep 25 09:30 Documents The -l option displays detailed information. The -a option includes hidden files, which commonly begin with a dot. You will frequently use this command when checking application files, configuration directories, and server contents. 5. Check Available Disk Space Run: df -h Example output: Filesystem Size Used Avail Use% Mounted on /dev/sda2 98G 24G 69G 26% / This command displays file system space usage in a human-readable format. It is useful when checking whether a Linux machine is running low on storage. These five commands are simple, but they introduce skills you will use throughout your Linux learning journey. How Can You Start Learning Linux? There are several ways to explore Linux without immediately replacing Windows or macOS. Option 1: Install Linux on a Virtual Machine A virtual machine allows you to run another operating system inside your existing computer. You can install Ubuntu using software such as VirtualBox. This is useful for beginners because you can experiment with Linux while keeping your main operating system. Option 2: Use Windows Subsystem for Linux If you are using a supported version of Windows, Windows Subsystem for Linux, or WSL, allows you to use Linux distributions within Windows. This is useful for practicing Linux commands and development tools. Microsoft provides installation instructions in its official WSL documentation. Option 3: Use a Live USB Some distributions allow you to boot a Linux desktop directly from a USB drive. You can explore the operating system without installing it permanently on your computer. Performance and hardware compatibility may vary. Option 4: Create a Linux Cloud Server If your goal is to learn server administration, you can create a small Linux virtual machine from a cloud provider. However, cloud servers may incur charges and require additional security precautions. If you are just starting, a local virtual machine is usually sufficient. Why Should You Learn Linux? Linux knowledge is valuable across several areas of information technology. For example, a system administrator may use Linux to manage servers, configure services, troubleshoot networking problems, and maintain infrastructure. A web developer may use Linux to deploy an application, configure Nginx, or manage a database. A DevOps engineer may use Linux to manage application deployments, containers, monitoring systems, and automation tools. Cybersecurity professionals also study Linux to understand system security, permissions, network services, and incident response. Learning Linux does not mean you must pursue one of these careers. It gives you additional technical skills that you can apply to personal projects, academic work, and professional environments. Frequently Asked Questions About Linux Can I use Linux without knowing programming? Yes. You do not need programming knowledge to use a Linux desktop or learn basic Linux commands. Programming becomes useful when you want to automate tasks or develop software. Can Linux run on an old computer? Some lightweight Linux distributions can run on older computers. However, hardware requirements depend on the distribution, desktop environment, and applications you intend to use. Can I install Linux alongside Windows? Yes. A dual-boot configuration allows you to install Linux and Windows on the same computer. You choose which operating system to start when you turn on the machine. Back up important files before changing disk partitions or installing another operating system. Do I need a powerful computer to learn Linux? No. Basic Linux commands and introductory system administration exercises can run on a modest computer or virtual machine. The hardware requirements increase when you begin running multiple servers, containers, or resource-intensive applications. Is Linux only for hackers? No. Linux is used by ordinary computer users, developers, researchers, students, businesses, and IT professionals. Security professionals use Linux, but cybersecurity is only one of its many applications. What Should You Learn After Understanding Linux? Now that you understand the fundamentals, the next step is to start using Linux regularly. You can begin with a desktop installation or virtual machine. Practice opening the terminal, navigating directories, inspecting files, and understanding system information. Once you become comfortable, explore file permissions, package management, process monitoring, networking, and basic server administration. You do not need to learn everything at once. Choose one topic, practice it, and move on when you understand how it works. Continue Learning With PinoyLinux PinoyLinux is a Filipino technology community focused on sharing Linux knowledge, open-source technologies, system administration, and practical IT experience. Whether you are a student exploring Linux for the first time, a developer learning deployment, or an IT professional improving your server administration skills, you can continue learning with the community. Visit PinoyLinux.org to explore additional articles, tutorials, and technical resources. Linux is something you learn by using it. Open your terminal, try a command, and start exploring.