Plan drawings are horizontal cuts through a structure that portray the arrangement and progression of spaces. Elevations show facades, room elevations, and other vertical elements of a structure projected into a vertical plane. The elevation drawing is typically the most familiar and recognizable to laymen. The illusion of depth is provided by varying line weights, not by diminishing size as in a perspective drawing. Typically buildings have four facades and, if possible, all four should be drawn.
Sections are vertical cuts through a structure that show the arrangement of spaces and objects.
What you see in a section drawing of a building is a series of room elevations in accurate relation to one another but separated by walls, floors, and ceilings. They are cut in a plane but may jog horizontally from floor to floor to reveal different information. The locations of section cuts are indicated on each floor plan. They are also valuable for structural details, interior decorative finishes, the relation of functions, and the relationship between interior and exterior spaces. Large-scale details explain how objects fit or together or relate to one another.