Exterior doors are designed for use as entry points to a building from the outside. They serve as a barrier between the interior and exterior of a structure, providing security, insulation, and protection from the elements. Exterior doors come in various styles, materials, and designs to complement the architectural aesthetics of a building while offering functionality. Common types include front doors, back doors, patio doors, and garage doors. They can be made from materials such as wood, fiberglass, steel, or glass, each with its own set of features, including insulation, security, and energy efficiency, to meet the specific needs of a property.