Spring hinge is a type of door hinge that has a built-in spring mechanism, allowing the door to automatically close after being opened. Due to it's self-closing action the door shut without needing a door closer.
It can be adjustable so as to adjust the tightness of the spring to control how fast or strong the door closes.
It is usually used in residential doors kitchen, bathroom, or backyard doors
Commercial buildings; Fire doors, office doors, or storeroom doors for safety compliance.