Advance Auto Parts is a retailer of automotive parts and accessories based in Roanoke, Virginia. The largest chain store of its kind, Advance Auto Parts has more than 5300 locations throughout the United States, Puerto Rico, the U.S. Virgin Islands and Canada. The company employs 74,000 people and is publicly traded on the New York Stock Exchange. In addition to their brick-and-mortar locations, Advance Auto Parts has an online store that allows customers to purchase parts and accessories online and then have them delivered to their local store or their homes. Most stores offer services in addition to products, such as installing batteries and testing starters, batteries and alternators.