Google Ad-Words is Google's main advertising service. The platform guarantees you a sought after page one listing for your website on a month to month, pay as you go basis.
You pick your budget and select a list of relevant keywords which we 'rent' for you to use for the duration of your Ad-Words campaign.
The minute your campaign goes live, your site will be visible on the first page of Google and here's the interesting part... You only pay if your advert is clicked on! Hence the name Pay Per Click.