A sofa is a piece of furniture designed for seating multiple people. It typically has a long cushioned seat, backrest, and armrests. Sofas come in various sizes, styles, and materials, and are often the centerpiece of a living room or family room. Some common types of sofas include sectional sofas, loveseats, sleeper sofas, and reclining sofas. Sofas can be made from various materials such as leather, fabric, or synthetic materials like microfiber. They are typically used for relaxation, entertaining guests, or watching TV, and can provide both comfort and style to a room.