Convertible couches, also known as daybeds, are pieces of furniture that can be used as both a couch and a bed. They are designed to provide seating during the day and sleeping space at night, making them a great option for small spaces. They typically have a frame made of wood or metal and a mattress that can be folded up or down. They come in a variety of styles and sizes, making them a versatile and stylish addition to any home.