Cement
The powdered binder that reacts with water to glue concrete together. Cement is an ingredient in concrete, not a synonym for it.
What does cement mean?
Cement is manufactured by burning limestone and clay at high temperature to form clinker, which is then ground to a fine powder. On its own it has almost no structural use; its job is to form the paste that coats and binds the aggregate. Because cement is by far the most carbon-intensive and expensive ingredient, most modern mix design is about using less of it without losing performance.
In practice
Calling a slab a 'cement driveway' is the most common vocabulary mix-up in the trade, and suppliers will usually still know what you mean.