Plumber's joint is a type of plumbing fitting used to connect two pipes together. It is made up of three parts: an ELBOW, an ELL, and a TEE. An ELBOW is a curved pipe that changes the direction of the flow of water, an ELL is a short piece of pipe with a 90-degree angle, and a TEE is a pipe fitting that has three openings and is used to connect two pipes in a T-shape. Together, these three components form a plumber's joint, which is used to join two pipes together.