Bouncers, also known as security personnel or doormen, are people employed at bars, nightclubs, and entertainment venues to ensure the safety of patrons. There are various similar terms used to refer to bouncers, such as door supervisors, security guards, crowd controllers, and event staff. Door supervisors are often employed in the UK to check IDs and keep order at clubs and bars. Security guards are commonly seen at concerts and sporting events, while crowd controllers manage large crowds at music festivals and other public events. Event staff can also perform duties similar to bouncers, such as checking tickets or managing entry to a venue.