A main door, also known as an entry door or front door, is the primary door through which people enter a building, house or apartment. It is usually located at the front of the building and serves as the main point of access for visitors, residents, and homeowners. Main doors come in a variety of materials, including wood, fiberglass, steel, and glass, and can be customized to fit the style of the building and the personal preferences of the homeowner.

Main doors can have different styles, such as traditional, modern, or rustic, and may have decorative elements such as panels, windows, or carving. They can also feature different types of hardware, such as doorknobs, handles, or locks, to provide security and ease of use. Some main doors may also have additional features such as weather stripping or insulation to help with energy efficiency and weather protection. The main door is an important component of the overall design and function of a building or home, providing both a means of entry and a first impression for visitors.