This document defines reinforced concrete and describes the types of concrete structures. It discusses the sub-structure, which includes the basement, foundation, ground beam and floor, and the super-structure, which includes the column, wall, flat roof and staircase. It provides examples of different types of foundations, floors, and roofs. Reinforced concrete is defined as concrete with reinforcement added to improve its properties. Concrete is a flexible material that is widely used in construction and reinforced concrete is stronger than other materials like timber and steel.