What are used as the basis for election-night "who won" announcements, made well before all of the ballots have been counted?

Name: What are used as the basis for election-night "who won" announcements, made well before all of the ballots have been counted?
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Exit polls are surveys conducted with voters as they leave their polling places, asking how they voted. These results are used as the basis for early "who won" announcements on election night, even though not all the ballots have been counted yet.

What Are Used as the Basis for Election-Night "Who Won