A something poster is a bed with curtains around it?

A four-poster bed is a type of bed characterized by its tall posts at each corner, which often support a canopy or curtains. This design offers both privacy and a decorative element, creating an intimate sleeping space. The curtains can be drawn closed for warmth or seclusion, enhancing the bed's cozy atmosphere. Four-poster beds have a long history and are often associated with luxury and elegance in bedroom decor.