Steps are craftable blocks found very early in the game. It can be crafted using three cobblestone in a horizontal line. Step blocks were formerly called stair blocks until a proper stair block was added. Steps form a half block and can be walked up by the player without the need to jump.
Placing two steps on top of one another will convert it into a full block and breaking it will only yield one step instead of the two used to place it. These steps affect lighting and liquids in the same manner full blocks do
History
In ClassicSurvival Test, steps could be obtained by mining a coal block because of the lack of inventory and crafting.
Despite the fact that Sneaking gives a player an apparent height of 1.5 blocks, doing so does not allow the player to walk over a single step with only a single empty block above it.