bifold

A bifold is an item designed to fold along a single hinge, producing two connected panels. The term is used as both a noun and an adjective to describe objects that are intended to be compacted for storage or easier access, and it appears across several industries.

In architecture and interior design, bifold doors consist of two or more panels connected by hinges that fold back in a concertina-like arrangement. When opened, the panels stack to one side, creating a wide opening that can link indoor and outdoor spaces. Bifold doors are commonly made from timber, aluminum, or uPVC and are chosen for daylight, ventilation, and space-saving properties.

In leather goods and fashion, a bifold wallet is a wallet that folds once, forming two sides. It typically includes compartments for bills, cards, and an identification window. The design contrasts with trifold wallets, which have an additional fold and more compartments.

In printing and documentation, a bifold refers to a sheet or sheet set folded to produce multiple panels, often used for brochures, menus, event programs, or promotional literature. The term emphasizes the fold and resulting page format rather than the exact number of pages.

Other uses include folding mechanisms in equipment or cases that rely on a single crease to reduce size during transport. The common thread across these meanings is the presence of a single, central fold that creates two main sections.