U.S. Auto Parts Network, Inc. is an online provider of automotive aftermarket parts and repair information. The Company is an online provider of aftermarket auto parts, including collision parts, engine parts, and performance parts and accessories. The Company operates through two segments: Base USAP, which is an auto parts business, and AutoMD, an online automotive repair source. The Company's Websites provide customers with a range of stock keeping units (SKUs) with detailed product descriptions, attributes and photographs. The Company's product database maps its SKUs to product applications based on vehicle makes, models and years. The Company primarily sells its products to individual consumers through its network of Websites and online marketplaces. The Company classifies its products into various categories, including collision parts serving the body repair segment, engine parts to serve the replacement/wear parts market, and performance parts and accessories.