In detective fiction, the audience surrogate is usually a minor character who asks a central character how he or she accomplished certain deeds, for the purpose of inciting that character to explain (for the curious audience) his or her methods.
In science fiction, the audience surrogate frequently takes the form of a child or other uninformed person, asking a relatively educated person to explain what amounts to the backstory. Clumsy use of this device is derided in the catchphrase, As You Know, Bob.
In superhero comics and other stories with a heroic central character, the audience surrogate is often the sidekick of the hero. Like the audience, the surrogate is normally young, permitting the audience vicarious participation in the hero's adventures.
The West Wing television series frequently uses audience surrogates to explain some aspect of politics. Donna Moss is probably the most commonly used, but other characters are used occasionally in areas which are outside their own fields of expertise.
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