"Although Linux gets much of the attention in the Free and open source operating system world, the BSD operating system is also
very popular. BSD has a longer history, and its roots go right back to one of the original Unix implementations that spawned commercial Unix variants like Solaris and Mac OS X. BSD is actually a popular source for server-focused operating systems and, due to an open license, it is sometimes more attractive to developers as the base for their projects. With some BSD variants, security and high-performance networking are key drivers."