Aftermarket parts are components made by companies other than the original manufacturer of a vehicle. These parts are designed to replace or enhance the original parts, often at a lower cost. They can include anything from brake pads to car batteries and are widely available through various retailers. Many vehicle owners choose aftermarket parts for repairs or upgrades because they can offer improved performance or customization options. However, it's important to ensure that these parts meet safety and quality standards, as not all aftermarket products are created equal.