Replacement parts are components designed to replace damaged or worn-out parts in various machines, vehicles, or appliances. They ensure that the original functionality is restored, allowing the equipment to operate efficiently. Common examples include car batteries, brake pads, and home appliance motors. These parts can be original equipment manufacturer (OEM) parts, which are made by the same company that produced the original item, or aftermarket parts, which are made by third-party manufacturers. Using the correct replacement parts is crucial for maintaining safety, performance, and longevity of the equipment.