Stairs are steps that connect floors or levels.
When people need to move between floors in a building, they use stairs. This means going up or down one step at a time until you reach your desired floor. Many houses and apartments have stairs leading from the ground floor to higher ones where bedrooms and living rooms often are. Office buildings might also have stairs connecting different stories.
A single step in a staircase.
A contiguous set of steps connecting two floors.
