Twin beds refer to two separate, side-by-side mattresses that are designed for use in a shared sleeping space. These beds are often used in hotels or other temporary accommodations where two people may be sharing a room and need a place to rest their heads at night. Twin beds can also be used in homes as an alternative to a traditional queen-sized bed, allowing for more flexibility in terms of sleeping arrangements. The term "twin" refers to the fact that each mattress is half the size of a standard queen or king-sized bed, and they are typically sold as a set so that they match in style and color.