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 hollow core, each offering different levels of durability and insulation. These doors can be hinged, sliding, or bi-fold, depending on the space available and the desired aesthetic. Interior doors also play a role in soundproofing and energy efficiency, helping to maintain a comfortable environment within a home. Proper installation and maintenance are crucial for their longevity and performance.