Checkmate - when is it not a Game Draw?

Question

What is the difference between Game Draw, Stale Mate, and Check Mate?

Sometimes I'll win a game on my pc and it tells me its a Draw. Why isn't it a checkmate? What are the rules regarding this final move?

Answer 1

Checkmate is where no possible moves can be made to protect a king who is alreay in check, meaning being threatened directly.
Stalemate is where no possible moves can be made without putting a king in check: it is illegal in chess to move your king into harms way; or when a series of moves, is repeated without hope of either side gaining an advantage, and with neither side being able to achieve a checkmate.
As far as your PC game is concerned, either it was an actual stalemate, or your game unfortunately is cheating you. I'm sure the manufacturers would call it a glitch, but we all know better.
A draw is an agreement between players that neither side will likely achieve checkmate, and so they agree to end the game before a long drawn out stalemate.

Answer 2

Intellectual Checkmate

Answer 3

stale mate - player cannot move, but is not in check.
check mate - player just won

draw- out of turns, or both players agree to call it a draw, or there is no way for either to win.

In terms of rank, stale mate and a draw are the same.

(edited because I messed up stale mate.)