Google AdWords is an advertising service that allows businesses to display ads on Google and its advertising network. Businesses only pay when people click on their ads, setting a budget and targeting keywords. AdWords costs vary based on auctions, with average costs between $1-2 per click and most expensive keywords over $50 per click. The program offers targeted, measurable advertising to help brands, with immediate impact while limiting spending globally or locally. However, AdWords may not always be effective and businesses need to avoid wasting money on low-quality keywords or ads.