This document discusses JavaScript functions. It begins with an agenda that outlines reviewing a pizza project, functions, parameters and arguments, the return keyword, and a lab. It then defines functions as reusable blocks of code that can be run multiple times. It discusses the basic structure of a function, naming functions, and using built-in and custom functions. It also covers parameters and arguments, using the return keyword to return values from functions, and code examples to demonstrate functions, parameters/arguments, and returning values. It concludes with instructing the reader to create a quiz testing HTML/CSS/JS knowledge and continuing work on the pizza site project.