Google AdWords allows advertisers to display ads on Google search results pages and search partner sites. Advertisers set keywords that are relevant to their business and location/language targeting to reach potential customers. They can choose between cost-per-click (CPC) and cost-per-acquisition (CPA) bidding to pay only when ads are clicked or generate a sale. Regular analysis of click-through rates and ROI allows advertisers to optimize keywords and ads for maximum effectiveness.