Concrete is a composite material composed of coarse granular material (the aggregate or filler) embedded in a hard matrix of material (the cement or binder) that fills the space among the aggregate particles and glues them together.
Famous concrete structures include the Hoover Dam, the Panama Canal and the Roman Pantheon. The earliest large-scale users of concrete technology were the ancient Romans and concrete was widely used in the Roman Empire—the Colosseum was built largely of concrete and the concrete dome of the Pantheon is the world's largest.
After the Roman Empire collapsed, use of concrete became scarce until the technology was re-pioneered in the mid-18th century. Today, concrete is the most widely used man-made material (measured by tonnage made) in the world.
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