Aftermarket parts are components made by companies other than the original manufacturer of a vehicle or equipment. These parts are designed to replace or enhance the original parts, often at a lower cost. They can include anything from brake pads to exhaust systems and are popular among car enthusiasts and repair shops. Many aftermarket parts are designed to improve performance, aesthetics, or durability. While they can offer cost savings, it's important to ensure that they meet safety and quality standards. Some aftermarket parts may void warranties, so consumers should research and choose wisely before making a purchase.