Costco is a membership-based American multinational retailer that operates a chain of warehouse clubs. The company was founded in 1983 and has since grown to become one of the largest retailers in the world, with over 750 warehouse clubs in the United States, Canada, Mexico, the United Kingdom, Japan, Australia, and other countries. Costco offers a wide range of products, including groceries, electronics, clothing, home goods, and more, at discounted prices. The company is known for its low prices, generous return policy, and high-quality products. Costco also offers additional services such as pharmacy, optical, and tire centers, as well as a loyalty program for its members.