Tilt shift photography is a way to make an image or film look like it’s of a toy miniture or the object is made of plastic — just by adjusting the focus used by the camera.
You can use a special tilt shift lens on your SLR camera, or you can manipulate the image digitally with Photoshop to change the focus to a much narrower frame of reference. Doing so makes the image appear much further away in the shot than it actually is.
You may have already seen some examples of tilt shift photography without even realizing it. Joss Whedon’s TV show DOLLHOUSE uses tilt shift photography in its opening credit sequence, seen here: