1) Reinforced concrete slabs are an important structural element used in modern buildings as floors and ceilings. They are supported by columns and beams. 2) There are different types of slab designs like corrugated, ribbed, and waffle slabs that improve the slab's strength-to-weight ratio by modulating the underside of the slab. 3) Concrete slabs can be cast either by being prefabricated off-site and transported or cast in place using formwork into which reinforcing steel bars and concrete are placed.