Interior doors are essential components of a building's layout, providing privacy and separation between different rooms. They come in various styles, materials, and sizes, allowing homeowners to choose options that match their decor and functional needs. Common materials include wood, fiberglass, and metal, each offering unique benefits in terms of durability and aesthetics. These doors can be hinged, sliding, or bi-fold, depending on the space and design preferences. Interior doors also play a role in sound insulation and energy efficiency, helping to maintain a comfortable environment within a home or office. Proper installation and maintenance are crucial for their longevity and performance.