Reply #31: Close, but not quite.

[newmajority]

Actually, OS X is built on Darwin BSD. BSD is a Unix based operating system, as is Linux. But there are minor differences in the two. Of course to know the difference, you would have to be a hardcore unix geek, and that's even beyond my level.

The advantage of Linux over the others is that it's free to anyone who can download it, and can be found cheap enough on CD's for those who can't. As opposed to Mac OS X or other branches of the Unix tree which are sold just like any other commercial software. There are some free BSD versions out there as well, but Linux seems to work better, in my experience.

Any of the above would be more secure than Windows, of course.