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I was trying to think of the name of a thing in the CSS vernacular the other day. It made me think we should have some kind of reference right here on CSS-Tricks, as a site with CSS in the title probably ought to have! So, here's the basics.
Breaking that down...
The whole thing is a ruleset.
The curly braces and everything inside is a declaration block.
The bit before the opening curly brace is a selector.
Each key/value pair, as separated by a colon and ending in a semicolon, is a declaration.
In those key/value pairs, the key is a property (or property name), and the value is a value (or property value).
Marco Biedermann once created this diagram out of HTML and CSS itself, which I think is exceedingly clever: