A bouncer is a person who is employed to provide security at an event or venue. The term 'bouncer' can refer to a variety of roles, including a BALL, GUARD, DOORMAN, DOORKEEPER, and ID checker. A BALL bouncer is responsible for ensuring that the BALL is not thrown out of bounds. A GUARD is responsible for protecting the premises from any potential threats. A DOORMAN is responsible for controlling access to the premises, while a DOORKEEPER is responsible for monitoring the entrance and exit of guests. An ID checker is responsible for verifying the age of guests, particularly minors.