A concrete slab is a flat, horizontal surface made from a mixture of cement, water, and aggregates like sand and gravel. It is commonly used in construction for floors, foundations, and pavements. The thickness of a concrete slab can vary depending on its intended use, with residential slabs typically ranging from 4 to 6 inches thick. Concrete slabs are often reinforced with steel bars or mesh to enhance their strength and durability. They can be poured on-site or pre-cast in a factory. Proper curing and finishing techniques are essential to ensure the slab's longevity and resistance to cracking and weathering.