What is the term for a drawing that represents the layout of a building's interior?

A floor plan is a critical architectural diagram that provides a representation of the interior layout of a building. It typically illustrates the arrangement of walls, doors, windows, and other structural elements, as well as how spaces within the building are organized. Floor plans are used in various fields, including architecture and construction, to guide the design and construction process, as well as to aid emergency responders in understanding building layouts for evacuation and firefighting strategies.

The other options refer to different types of layouts not specifically focused on the interior. An exterior layout pertains to how a building looks from the outside, while a site plan shows the entire property, including the building's placement relative to the surrounding land features. A plot plan delineates the boundaries of a specific piece of land and may include topographical information, but does not focus on the detailed internal layout of a building. Therefore, a floor plan is the most accurate term for representing a building's interior layout.