Costco is a membership-only warehouse club that offers a wide range of products at discounted prices. It is known for its bulk quantities and competitive prices. Costco sells a variety of items including groceries, electronics, furniture, appliances, clothing, and more. The company also offers services such as travel, optical, pharmacy, and photo printing. Costco is known for its high-quality products and excellent customer service. The membership fee allows customers to access exclusive deals and discounts.