A mattress is a large, rectangular pad designed to support the body during sleep. It is typically made of materials such as foam, innerspring coils, or latex, providing comfort and pressure relief. Mattresses come in various sizes, including twin, full, queen, and king, to accommodate different bed frames and sleeping preferences. Mattresses are often covered with fabric and may include additional features like pillow tops or memory foam layers for enhanced comfort. Proper care and maintenance, such as regular cleaning and using a mattress protector, can extend the lifespan of a mattress, ensuring a good night's sleep for years to come.