Costco is a membership-based warehouse club that offers a wide variety of products at discounted prices. Founded in 1983, it operates on a model that allows customers to buy in bulk, which helps reduce costs. Members pay an annual fee to access the store, where they can find groceries, electronics, clothing, and household items. With locations primarily in the United States and several other countries, Costco is known for its large warehouse-style stores. The company emphasizes quality and value, often featuring its own brand, Kirkland Signature, which includes a range of products from food to household goods.