Transitions

Straight Cut
An instantaneous cut between two shots can be used to move through within a scene or between a scene.

Fade in or out
The shot turns to or from black telling the scene has began or ended.

Dissolve
A merging between two shots signals a passing of time.

Wipe
A line wipes off one shot to the next; signal a move to a different scene.

Iris
The shot shrinks in a circle to the next shot; signal a move to a different scene.