Single-leaf entrance doors are doors consisting of a single separate leaf or panel. The term "single-leaf" indicates that the door has only one part that opens or closes. This is a typical option for many entrance doors in houses, apartments, offices, and other buildings. Single-leaf doors come in various types and styles, and they can be made from different materials such as wood, metal, glass, and plastic. The choice of material and design depends on functional and aesthetic requirements, as well as the overall style of the building or space where the door is installed.