Kali Linux is a specialist, Debian-derived distribution that comes with an array of digital forensics and penetration testing tools.
It is maintained and funded by Offensive Security Ltd and is designed to be user-friendly.
Offensive Security also offers training courses and resources that complement Kali Linux.
The distribution is ideal for penetration testing because it is lightweight, flexible, and customizable, making it suitable for use in virtual machines and on discs.
It can be used for security testing across a range of scenarios and is designed for both ethical hacking and network security testing.
The many tools that come with Kali Linux include Nmap, which is used for host and service discovery; Metasploit, which is used to develop and execute exploit code; Wireshark, which is used to analyze network protocols; and Aircrack-ng, which is an suite of tools used for WiFi security testing.
Kali Linux is open source and free, making it a valuable resource for anyone looking to learn more about penetration testing.