A four-poster bed is a type of bed characterized by four vertical posts, one at each corner. These posts can support a canopy or curtains, providing privacy and warmth. Traditionally, four-poster beds were popular in the Middle Ages and were often used in grand homes and castles. The design of a four-poster bed can vary widely, from ornate and elaborately carved styles to simpler, more modern interpretations. They are often made from materials like wood or metal, and can serve as a focal point in a bedroom, combining both functionality and aesthetic appeal.