What is this tactic called?

Is there a term for the tactic of attacking a peice and your opponent cannot move to avoid the attack without putting himself in check?

This comes up a lot in games and is usually a devastating move when the attacked peice is a queen.  Sample board below.

Thanks in advance for the info!

Skewer

It's called a "Pin". When a piece is "Pinned" against the King I think it is also referred to as an "absolute pin" - as it's illegal to move the "pinned" piece.

@ Kyle - This would be a "Skewer"

@Benkobaby - Thanks for info.  I'm suprised there's not a special case (term) for a pinned queen.

@KyleMayhugh - Skewer, or X-ray attack, is something different.  Where the attacked peice is on the otherside of the king, for example, if the positions of the black K & Q were reversed (see below), this would be an X-ray.

@ C-Sure - The example you have given is also often referred to "as the end of the game" 

Chess.com has a page that goes over various tactics.

http://www.chess.com/article/view/chess-tactics--definitions-and-examples

Its alos called  'Lights Out'  *lol

This is a "Pin" and a “Skewer” because you are really attacking the piece behind the primary attacked piece. I recommend reading a beginners book on the “weapons of chess” Bruce Pandolfini is a good chess author and teacher. His books are carried by all public libraries. 

lol guys, x-ray and skewer are two names for the same thing.  As said above this is when the more important piece is in front.  Doesn't have to involve a king.

A pin is the same idea but with the more important piece behind (pinning the lesser piece to its defense).