This document provides an introduction to search engine marketing (SEM) and pay-per-click (PPC) advertising on Google AdWords. It discusses the basics of how AdWords works, including how advertisers are charged on a cost-per-click (CPC) basis. The document also outlines some of the key benefits of using AdWords, such as its ability to reach global markets cost effectively and with flexibility. Setting up an AdWords campaign is described as relatively simple, though success requires more than just getting started.