A doorman is a person who is responsible for the security and safety of a building or area. The job of a doorman can be broken down into three main roles: PORTER, BOUNCER, and GUARD. A PORTER is someone who is responsible for the upkeep of a building, such as cleaning and maintenance. A BOUNCER is someone who is responsible for controlling access to an area, such as a nightclub or bar. Finally, a GUARD is someone who is responsible for protecting an area from potential threats. All three roles are important in ensuring the safety and security of a building or area.