Convertible furniture is a type of furniture that can be easily changed from one form to another. The two most common types of convertible furniture are sofas and sofabeds. A SOFA is a piece of furniture typically used for seating two or more people, while a sofabed is a SOFA that can be converted into a bed. Both sofas and sofabeds are great options for those who need extra sleeping space but don't have the room for a full-sized bed.