The official answer: Matter is anything that has mass and volume

The official answer: Matter is anything that has mass and volume. If you can weigh something and if you can see something, it's matter.

The answer that actually makes sense: Matter is what we refer to when we say "stuff." If I've got a hammer or a dead squirrel in my closet, I'd say that there's a bunch of stuff in there. If I've got a magnetic field in my closet, there's no stuff in there.

So, to give examples of matter, just name anything. Or, to put it more precisely, any thing. If you would refer to it as stuff (the hammer or dead squirrel earlier) or can throw it at your sister (a paperweight with Pee Wee Herman in it), it's matter.

OK.