what is the difference between cement and concrete?

Indeed, sir. Cement is a binding agent, it's the paste that holds things together. When mixed with water, it hardens into a solid mass. Concrete, on the other hand, is a composite material made by combining cement, aggregate (such as sand and gravel), and water. It is the final product you see in construction, from foundations to sidewalks. So while cement is a component of concrete, they are not one and the same.