Concrete is a building material used for construction purposes. It is a mixture of 4 components: mineral, binding agent, chemical additives, and water. Sand, gravel or crushed stone is usually the mineral used. The binding agent can be either natural or synthetic cement. Concrete is used in a variety of projects like roads, bridges, factories, waterways, and airports. In the case of domestic purposes like garage, floors, sidewalks, and patios, a mixture of sand, cement, and gravel is used to make concrete. The concrete is also usually reinforced with steel rods or wire mesh for better strength.