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Concrete is a construction material made from a mixture of cement, aggregate (usually sand and gravel), water, and admixtures. Cement is a binder, a substance that sets and hardens independently, and can bind other materials together. The most common form of cement is Portland cement. Concrete is used in many different ways, including paving roads, making buildings, bridges, dams, and more. It is the most widely used man-made material in the world. Cement is an ingredient in concrete, but it is also often used on its own. When used on its own, cement can be mixed with water to create mortar or with aggregates to create concrete. Mortar is used for things like bricklaying and stonework, while concrete is used for paving, foundations, and more. Cement is made from limestone that has been heated in a kiln. The resulting substance is a dry powder that can be mixed with water to create a paste. This paste is then used as the binder in concrete or mortar.