'walk-through' definitions:

A thorough explanation (usually accompanied by a demonstration) of each step in a procedure or process; "she gave me a walk-through of my new duties"

A pedestrian passageway through the ground floor of a building

A first perfunctory rehearsal of a theatrical production in which actors read their lines from the script and move as directed

The act of walking in order to view something; "the realtor took her on a walk-through of the apartment"