Terry stops refer to a brief detention of an individual by law enforcement officers based on reasonable suspicion that the person may be involved in criminal activity. This legal concept originated from the U.S. Supreme Court case Terry v. Ohio in 1968, which allowed police to stop and question individuals if they have specific and articulable facts suggesting that criminal activity is afoot. The key element of a Terry stop is the balance between an individual's Fourth Amendment rights against unreasonable searches and seizures and the need for police to prevent crime and ensure public safety.