Frozen - as in "My computer has frozen" or "The (computer) game has frozen."

What is it?
Means that the expected function of the computer or game has ceased to continue. It may return some time later. It can usually be resolved by restarting the computer.

Why is it so?
It is usually the result of an unexpected (for the computer) series of actions or events, particularly the cumulative effect of these actions.

What do I do?
If you computer is frozen usually just restart it (preferably using a software restart rather than a hardware restart). In online games, the function of the game is more likely to be the cause rather than the user's computer. In this case you need to wait until the game has fixed the problem (perhaps by restarting the game server).