catwalk

the long, narrow stage that models walk along in a fashion show

a narrow path, raised above the ground, often built for workers to walk on outside a building that is being built or repaired

a narrow structure built beside a bridge or building or above a stage, used for walking or performing work

A catwalk is also a long, narrow stage used in a fashion show by models (= people employed to show how new clothes look when they are worn).