Dark Matter is a specific kind of theoretical matter that is extremely dark, and is comprised of some kind of strange 'matter-like' properties, in that it occupies space and it seems to exist. 
However, it isn't really matter and it isn't actually dark either. Scientists just call it that because they haven't quite figured out what it's made of yet. But apparently it exists because they've detected a massive portion of the universe that contains something unexplainable, and the truth is that this stuff is what most of the entire universe is made of and we have absolutely no idea what it is.

In summary, dark matter is something that we can't really define clearly yet due to lack of current scientific understanding, but it appears that it's basically almost everywhere.
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