Kali Linux is an open-source, Debian-based Linux distribution geared towards various information security tasks, such as Penetration Testing, Security Research, Computer Forensics and Reverse Engineering.

Is Kali Linux a program or an OS?

The open-source Kali Linux operating system (OS) allows pen testers use the same exploits as malevolent, would-be hackers – tasks that would be needlessly difficult or impossible with a standard OS.

Is Kali Linux a normal OS?

No, Kali is a security distribution made for penetration tests. There are other Linux distributions for daily use such as Ubuntu and so on.