What defines a survival horror?

[Hunter of Shadows]

Oh forgot one, Bioshock <3
One of the best examples for survival horror

Bioshock is too easy for that

System Shock 2 would be considered survival horror cause you know...it can actually be hard to survive

The first 3 resident evil games are very good examples of survival horror!

How, you're an action man with a gun, the only 'survival' part of it is make sure you shoot everything to death, that and zombies are so often overused...