Slabs

Slabs are half as tall as a block and can be crafted using a row of 3 blocks by using these blocks:

Crafts

2 Stone Slabs above each other are used to make Concrete.

Stone Brick Slab/Cobblestone Slab + Moss makes Mossy Brick Slab/Mossy Cobble Slab

Usage

you use it as a alternate choice for stairs if you don't have that much materials