BlackArch Linux is a penetration testing distribution based on Arch Linux. It is designed for security professionals and researchers and comes with a wide range of security tools pre-installed. It includes over 2000 tools for tasks such as penetration testing, vulnerability scanning, and forensic analysis. It also has a live ISO that can be used to boot the system and perform tasks without installing to a hard drive. It is important to note that it is intended for experienced users and should be used only for legal and ethical purposes.