What is interior in simple words?

Interior in simple words means inside. It is the inner part of something, not the outside. For example, interior of house means inside the house where you live, with rooms like bedroom, kitchen, living room, not the outside walls or yard. Interior of car means inside car where you sit. Interior of box means empty space inside box. As adjective, interior means inner or inside, as interior door means door inside house, interior paint means paint for inside walls. So interior is opposite of exterior which means outside. In simple terms, if you open something and look inside, what you see is interior. For people, interior can mean inside thoughts or feelings, but usually it means inside space. Interior design in simple words means decorating inside of home to make it nice and comfortable, choosing colors, furniture, and lights for inside. So interior equals inside part. For example, the apple's interior is white inside after you cut it. So whenever you hear interior, think inside, inner part, or inside space.