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The term "fourth wall" comes from staging plays. On a stage there are three walls that are built, leaving out the fourth so that the audience can see what is going on. The term has come to mean the separation between a fictional world and the audience. "Breaking the Fourth Wall" often refers to a character addressing the audience, such as an aside in a screen play.
The fourth wall is a great and often used way of word padding. In some works, it is used for comedic effect. Sometimes a narrator will use it to relay information to the audience that either the characters don't know, or already know, but learned when the audience wasn't "present" such as before the storyline began.