Door closers come in a variety of models depending on the type of door it will serve including manual doors, automatic, and electromagnetic wing.
They also come in different sizes depending on the weight and use of the door.
Some closer devices very obvious and others are more concealed.
These closers should be professionally installed to be sure they operate smoothly.
Over the years it can experience some issues.
With exposure to weather it can begin to sag or splinter.
With freeze and thaw and refreeze, it can start to buckle. Other problems might be failure to fully close, hydraulic leak, or loss of spring tension.
Some smaller items would be the door slamming or the swing cycle moving faster than usual.
When that happens, it is a good idea to schedule a maintenance visit to bring your door back into good working order.