This document provides an overview of concrete, including its composition, uses, raw materials, types, and properties. Concrete is a composite material composed mainly of water, aggregate, and cement. It is widely used in construction for buildings, infrastructure like roads and bridges, and other structures. The main types discussed are normal concrete, high-strength concrete, lightweight concrete, and self-compacting concrete. High-strength and lightweight concretes use special additives and aggregates to achieve higher strength or lower density, while self-compacting concrete requires no vibration during pouring. Concrete continues to be a vital building material worldwide.