Minecraft (Pocket Edition)
Usage / Purpose
Stairs are useful as a they allow you to move up and down from deep locations by walking forward instead of hop-stepping. Stairs make each step taken a half-step which makes walking slopes faster and easier.
Stairs are also useful as a roofing material (see Villages as a naturally generated example of wooden Stairs used for this purpose).
Stairs are stored in stacks of up to 64 units.
Stairs can also be placed upside down to provide a surface to store your Cake.