Memory foam is a type of polyurethane foam that was originally developed by NASA in the 1960s. It is known for its ability to mold and conform to the shape of an object when pressure is applied, and then return to its original shape once the pressure is removed. This unique property makes memory foam ideal for use in mattresses, pillows, and other products designed to provide comfort and support. The foam's viscoelastic nature helps distribute body weight evenly, reducing pressure points and providing personalized comfort for users.