Transitisons e.g Dissolve, fade, wipe

Dissolve is a transition two images which one fades out and then other fades up. Usaully see Dissolves in films that has dream squences or a flashback because it has a hallucinate effect. Fade is a transition is when picture suddenly appears (fade in) and (Fade out) is when the picture suddenly disappear. Wipe is a transition that goes across the frame like a bar to remove a shot to make way for an another shot. Here's a clip from the film "Psycho"



In this scene, At 2:50 there's a close shot of drainhole and then fade in with a close shot of the eye to juxapose both of them.