What is Linux?

If you’re getting into cybersecurity, you’re going to hear about Linux — a lot. It’s the backbone of most servers on the internet, the operating system powering everything from Android phones to supercomputers, and the playground where security professionals do their best work.

Linux is an open-source operating system, which means anyone can view, modify, and distribute its source code. Unlike Windows or macOS, Linux gives you complete control over your system. This is why it’s the go-to OS for penetration testing (hello, Kali Linux), server administration, and security research.

Why Should You Care?

If you’re studying for certifications like CompTIA Security+ or CEH, you’ll be working in Linux environments constantly. Most security tools — Nmap, Wireshark, Metasploit, Burp Suite — run natively on Linux. Understanding the terminal, file permissions, and process management isn’t optional; it’s foundational.

My advice: spin up a virtual machine with Ubuntu or Kali Linux and start exploring. Break things. Fix them. That’s how you learn. The command line might feel intimidating at first, but once it clicks, you’ll wonder how you ever lived without it.