what is fink?
I don't have a Mac, but from the context I think its obvious that it is some type of software, perhaps a utility or programming tool of some kind.
Then again, this perspective comes from the fact that I've done programming before, and I'm also no stranger to the command line.
Edit: If you really want to know, Google is useful for finding out such things - Not to be rude, but I'm not going to look it up and research it for you.
...And of course there's the wikipedia, which also has a lot of (usually) good information.