A sofa, also known as a couch, is a piece of furniture designed for seating multiple people. It typically has a backrest and armrests, and may or may not have cushions for additional comfort. Sofas come in various sizes, styles, and materials, ranging from traditional to modern, leather to fabric. They are commonly found in living rooms, family rooms, and other areas of a home where people gather and socialize. Sofas can be used for sitting, lounging, and even sleeping, making them a versatile and essential piece of furniture in many homes.