Kali Linux is a Debian-based Linux distribution designed for digital forensics and penetration testing. It is maintained by Offensive Security and supports 32-bit and 64-bit architectures for x86 systems as well as ARM. Key features include NetHunter for porting Kali to Android devices to enable wireless injection and other penetration testing tools from mobile devices. Kali Linux has gained popularity in culture from appearances on the TV show Mr. Robot and focuses specifically on security through dedicated developers and package signing rather than general security fixes.