What is this? 

It's a move to block check.

It's an opening called Spanish game or Ruy Lopez.

A chess move. A knight move. The beginning of a chess game. Part of a chess game.

it is an opening,not good for white

Sparta!

Well, the question wasn't specific.

And what makes you say that then?

Sigh... I  know it is the Ruy Lopez -_-.. But what is this variation called?

It's an irregular "Open Variation". Good for white and not much seen, according to Game Explorer.

This is the Open Variation of Ruy Lopez (upto move 5. After 5. O-O Nxe4 book recommends instead of 6.Re1 6.d4 -MCO14)

Hmm yes I just tried this on someone and he moved to 6.d4, I won that game, but it was very irregular 

why didnt anyone say its a bird, its a plane... am I the onlyone with this kind of dry humor? (rhetorical)