A sofa bed is a versatile piece of furniture that combines the functions of a sofa and a bed. It typically features a foldable mattress hidden within the sofa frame, allowing it to be transformed into a sleeping surface when needed. This makes it an ideal choice for small living spaces or guest rooms, providing both seating and sleeping options without requiring extra space. Sofa beds come in various styles, sizes, and materials, catering to different tastes and needs. Some models have a simple pull-out mechanism, while others may require more effort to set up. They are popular in homes, apartments, and even hotels for accommodating overnight guests comfortably.