Replacement parts are components designed to replace damaged or worn-out parts in various machines, vehicles, or devices. They help restore functionality and extend the lifespan of the original item. Common examples include car batteries, brake pads, and computer hard drives. 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 replacement parts can be a cost-effective solution for repairs, ensuring that the equipment continues to operate efficiently.