Walking surfaces constructed for pedestrian usage including floors, ramps, walks, sidewalks, stair treads, parking lots and similar paved areas which may be reasonably foreseeable as pedestrian paths. Natural surfaces such as fields, playing fields, paths, walks, or footpaths, or a combination thereof, are not included.[ASTM F1637-95

a path set aside for walking; "after the blizzard he shoveled the front walk"

is a covered or roofed pedestrian thoroughfare used to connect two or more buildings.

A walkway is a path for walking that is generally not enclosed. It can be at ground level, or it can be elevated. It can be a simple constructed path or something more complex to cross a road or a body of water.