Tailgating occurs when an authorized person opens a door, and other people, who may or may not be authorized, also enter.
Tailgating is the practice of closely pursuing an authorized individual into a space with limited access. A tailgating social engineer might grab a heavy door that a regular employee is opening just as it is about to close and walk right into the targeted physical system.
The first intercollegiate football game, between Princeton and Rutgers in 1869, is when the tradition of tailgating originated, according to the American Tailgater Association. The phrase originated when spectators gathered to grill sausages at the "tail end" of a horse.
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