Tilt-shift photography is a technique that transforms photographs of real full size subject matter into what looks like miniature scenes. This can be achieved two ways.
One way is in camera with a special lens that allows you to control the rotation relative to the image plane and movement parallel to the image plane, tilt and shift. Tilt controls what is in focus and shift allows you to change the line of sight while keeping it parallel to the subject being shot.
Another way is to fake it in post processing with Photoshop. I will go through a technique to do this in an upcoming tutorial.