awk, mawk, nawk, gawk... WHAT?

awk, mawk, nawk, gawk... WHAT? I've just started learning awk and I'm a little confused about all those versions around. Is there any "version" which is found on all Unix-like systems? Like, you know, plain vi? Does the standard awk support the -F option?
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Guest [Entry]

awk will be on just about every *NIX based system, but the exact specifics of what it supports will shift slightly as it's entirely possible it will simply be symlinked to a different version akin to how /bin/sh is often linked to a specific shell, often bash or one of its derivatives. (For the record, I also know alot of machines where vi is symlinked to vim as well.)