A "replacement part" is a component designed to replace a damaged or worn-out part in a machine, vehicle, or device. These parts are essential for maintaining the functionality and performance of the original item. For example, if a car has a broken brake pad, a replacement part can restore its braking system. Replacement parts can be purchased from various sources, including manufacturers, auto parts stores, and online retailers. They come in different types, such as original equipment manufacturer (OEM) parts, which are made by the original maker, and aftermarket parts, which are produced by third-party companies.