Overstock.com is an American e-commerce company founded in 1999 that operates as an online retailer offering a wide range of discounted products. Originally focused on selling surplus inventory from failed dot-com companies, it has evolved into a major online marketplace.

The company sells its own inventory and acts as a platform for third-party sellers. It offers customer-friendly features like rewards programs, customer reviews, and a price-match guarantee. Overstock.com has also shown interest in blockchain and cryptocurrency technology and became one of the first major online retailers to accept Bitcoin as payment in 2014.