It’s a family of operating systems directly derived from Berkeley Unix. There are three major distribution, which are: OpenBSD, FreeBSD and NetBSD. Another less known distribution is DragonflyBSD which aims to be a micro kernel operating system. The BSD distribution aren’t like Linux distributions, they are entirely different operating systems although they might share some components. BSD licenses (2)t “copyleft”.
https://www.freecodecamp.org/news/bsd-operating-system/ https://en.wikipedia.org/wiki/Comparison_of_BSD_operating_systems FreeBSD FreeBSD in 100 Seconds - Fireship