Plumbing pipes and fittings refer to the various components used in plumbing systems to transport water from the source to the point of use. These include piping materials such as PVC, copper, and PEX, as well as various types of fittings like elbows, tees, couplings, and valves. It is important to choose the right materials and fittings for your plumbing system to ensure proper function, durability, and efficiency. Factors to consider when selecting plumbing pipes and fittings include water pressure, flow rate, temperature range, and the type of water being used.