PVC fittings are components used to connect sections of PVC pipe together or to change the direction of the piping system. They are made from polyvinyl chloride (PVC), a durable and versatile plastic material that is widely used in plumbing, irrigation, and industrial applications. PVC fittings include various types such as elbows, tees, couplings, and adapters, each designed for specific functions within a piping system.