Kali Linux is based on Debian’s test version as its base. Kali Linux was previously known as BackTrack Linux. Kali Linux is pre-installed with over 600 penetration-testing programs, including nmap (a port scanner), Wireshark (a packet analyzer), John the Ripper (a password cracker), Aircrack-ng (a software suite for penetration-testing wireless LANs), Burp suite (an intercepting proxy), OWASP ZAP (an application security scanner), and many others.

The first public release was on 13 March, 2013. It is maintained and funded by Offensive Security Ltd. Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing. It is also the basis for many derivative distributions such as Ubuntu. Debian GNU/Linux, which includes the GNU OS tools and Linux kernel, is a popular and influential Linux distribution.

Debian is a computer operating system composed of software packages released as free and open-source software primarily under the GNU General Public License along with other free software licenses.

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