A door closer is defined as any mechanical device that closes a door in a controlled manner, preventing it from slamming, in general after someone opens it, or after it was automatically opened. Cost-effective door closers are commonly used as a fire prevention measure, typically installed on fire doors, as well as helping to prevent draughts. 

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Surface-mounted closers are commonly used for aluminum storefront doors and are the best option for low- to-medium traffic entrances. Overhead concealed door closers are best used in medium-to-heavy traffic areas. For doors installed at exterior locations, the closer should be mounted inside of the building where possible. On interior openings, closers are often specified to be installed on the least public side of the openings.