How it`s call this effect & how to make it in photoshop?

TnX (:

It's called DOF - Depth of field and you can simulate it by just blurring parts of the image in PS.

What sam said.

But with a link to show you how it's done
http://www.photoshopessentials.com/photo-effects/depth-of-field/

Normally, like in the photos you posted, it is done with the photographer focusing on different area of the subject