Google's advertising solution which can spread ads to millions of users is Adwords. AdWords is a quick and simple way to advertise on Google, regardless of one's budget.

  AdWords ads are displayed along with search results on Google, as well as on search and content sites in the growing Google Network, including AOL, EarthLink, HowStuffWorks, & Blogger, other publishers of Google etc. With searches on Google and page views on the Google Network each day,  Google AdWords ads reach a vast audience.

 Google AdWords is a nice advertising solution for a relatively unknown or new web site/home page/web service because it brings content specific and interested customers to them at manageable investment within no time. When one create an AdWords keyword-targeted ad, they have to choose keywords for which ads will be displayed, the maximum amount willing to pay for each user click etc. Precisely the site owner needs to pay only when someone clicks on the ad and reach site.