A state trooper is a type of law enforcement officer who is responsible for enforcing traffic laws, investigating accidents, and responding to other emergencies within the state. The term state trooper is primarily used in the United States, and different states may use different titles for their troopers. Some other terms that can be used interchangeably with state trooper include state police officer, highway patrol officer, and state highway patrol officer. These officers are typically highly trained and have specialized skills that allow them to handle a variety of situations on the roads and highways of their respective states.