Kali Linux is a penetration testing Linux distribution. It was created by Offensive Security as the successor to the famous BackTrack. Kali Linux is a single operating system with all the possible tools and utilities needed for conducting a penetration test and forensics.

The amazing benefit of this distro is that it can be installed on a virtual machine, on a hard drive, it can be live-booted via USB, and can be installed on mobile devices, such as the Google Nexus, OnePlus smartphones, and the Raspberry Pi computer.

There are many categories of tools, such as information-gathering, scanners, password-cracking, exploitation development, post-exploitation, and forensics. The possibilities with Kali Linux are endless.