What does interior mean in a house?

Interior in a house means the inside part of the house, all spaces, surfaces, and elements within exterior walls, roof, and foundation, where people live. It includes rooms such as living room, bedrooms, kitchen, bathrooms, hallways, closets, and all inside features like walls, ceilings, floors, doors, windows from inside view, trim, baseboards, staircases, and built-ins. It also includes interior finishes like paint colors, flooring materials such as hardwood, tile, carpet, lighting fixtures, plumbing fixtures, and cabinetry. In design sense, interior in a house refers to interior design and decoration, meaning how inside looks and feels, including furniture, rugs, curtains, art, and decor that make house comfortable and functional. For example, house interior with modern interior means inside is decorated with clean lines, neutral colors, and contemporary furniture. Interior square footage means livable area inside house. Interior doors are doors inside house between rooms, not leading outside. So interior in a house is essentially everything inside the shell of house, opposite of exterior which is outside walls, yard, roof, and siding, and is what you experience when you are inside home.