What is Portland cement used for?

Portland cement is used to make concrete. And concrete is what we build things with. No large structures could exist without it, and concrete is used even in the construction of most smaller structures - like houses. Concrete forms a foundation or footing for most structures in modern societies. And aside from its use in concrete, cement is used in motar for applications in masonry. We also make stucco out of it, and stucco is an exterior finish for many homes and small structures. Additionally, most "regular" grout for tile and stonework is made from cement. The "fuzzy" term infrastructure includes roadways. Imagine roadways with no concrete. How about influent and effluent waterways? Most of these are built with concrete. We could go on, but we'd be here all day. Concrete is all around us. We just don't see it unless we look for it. Start looking and thinking about it and see what you can see.