A sofa bed is a versatile piece of furniture that combines a sofa and a bed in one design. It typically features a foldable mattress that can be pulled out from the seating area, allowing it to transform from a couch into a sleeping space. This makes it an ideal choice for small living areas or guest rooms where space is limited. Sofa beds come in various styles, sizes, and materials, catering to different tastes and needs. They are often used in homes, apartments, and even hotels, providing a practical solution for accommodating overnight guests without requiring a separate bedroom.