If in your film for a spot you wanted one scene to fade out while the following scene simultaneously fades in, you'd use the optical technique known as:

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Quizplus · Accepted Answer

A dissolve is the optical technique used to achieve a gradual transition from one scene to another by fading out the first scene while simultaneously fading in the next scene. A cut is an abrupt transition between scenes, while a matte is a technique used to combine separate images into a single image. A superimposition (super) is when one image is placed over another image, often with transparency. A fade-through is not a commonly used term in film production.

If in Your Film for a Spot You Wanted One