🏷️ Table of Contents
Open Source Meaning
Imagine a random developer writes a piece of software. Instead of keeping the code private, they publish it online so anyone can view, use, modify, or improve it. That’s the basic idea behind open source.
The source code of a Linux distribution (or any other open-source program) is publicly available, allowing anyone to study how it works or create their own modified version.
Most Linux distributions are open source and completely free to download and use. Keep in mind, though, that if you run into a problem, your first line of support is usually the community. In other words: Google is your best friend.
The opposite is closed-source (also called proprietary) software. Its source code is not publicly available, so you can’t view or modify it. In return, commercial products often include professional support teams who can help troubleshoot issues when they arise.
Open source gives you freedom and community support, while closed source focuses on commercial support and proprietary development.
Linux Distribution
A Linux distribution (or distro) is an operating system built on the Linux kernel. Each distro includes its own collection of software, package manager, desktop environment, and tools, making it suitable for different types of users.
Popular Linux distributions
- Ubuntu – beginner-friendly, excellent desktop and server choice
- Fedora – modern, secure, and packed with the latest technologies
- Debian – famous for its stability and reliability
- RHEL (Red Hat Enterprise Linux) – enterprise-grade Linux with commercial support
- CentOS Stream – a rolling preview of the next RHEL releases
For beginners, Ubuntu and Fedora are among the most popular choices. Both are easy to install, receive regular security updates, and are widely used on desktops as well as servers.
Linux for Cyber Security
Popular distributions used in cybersecurity include:
- Kali Linux
- Parrot OS
- BlackArch
- Pentoo
- Ubuntu
- Debian
- Raspberry Pi OS (for ARM devices and security projects)
Differences between Linux distributions
- included software and packages
- package management system
- desktop environment (user interface)
- target audience and purpose
For example, Kali Linux comes preloaded with hundreds of penetration testing and forensic tools, making it a favorite among security professionals. Ubuntu is designed for everyday desktop users, Debian is widely trusted for servers and embedded systems, and RHEL is a standard choice in enterprise environments where long-term stability and professional support are essential.