
A sash window is a traditional window featuring one or more movable panels (called "sashes") that slide vertically or horizontally within a frame.

Casement windows are attached to a frame by side or top hinges and swing outward (or inward) like a door.

Bifold doors use a concertina-style folding mechanism along a track to create wide openings and maximize natural light.

Sliding doors glide along tracks instead of swinging into a room, which can save around a square metre of floor space per door.