Accordion doors are a popular choice for room dividers and closet doors. They offer a space-saving design and easy operation. However, there are several other words that can be used to describe accordion doors including folding doors, concertina doors, and bi-fold doors. Folding doors consist of hinged panels that fold in on themselves as they are opened. Concertina doors are made up of slatted panels that fold back in a zig-zag fashion. Bi-fold doors are similar to accordion doors but typically consist of two panels that fold in the middle. Regardless of the term used, these versatile doors can add both functionality and style to any space.