It is perfect for doors but can also be used to model chains pendulums etc.
Unity door hinge joint.
A gameobject s functionality is defined by the components attached to it.
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For a summary of the 2d joints see joints 2d documentation.
Unity provides the following joints that apply different forces and limits to rigidbody components and therefore give those bodies different motion.
A single hinge joint should be applied to a gameobject the fundamental object in unity scenes which can represent characters props scenery cameras waypoints and more.
2d joints have 2d at the end of the name for example hinge joint 2d.
The hinge joint groups together two rigidbodies constraining them to move like they are connected by a hinge.