A sofa is a piece of furniture typically used for seating in a living room. It typically consists of a backrest, armrests, and a seating surface, and can seat one or more people. Sofas can come in a variety of styles, such as traditional, modern, or contemporary, and can be made from a variety of materials, including leather, fabric, and microfiber. They can also come in a variety of sizes, ranging from small loveseats to large sectionals.