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http://www.google.com.au/adwords
Google AdWords is Googles advertising product, which displays your ads to people looking for your products or services on Google or its partner sites.
When you advertise with AdWords, you pick words or phrases (called keywords) that are related to your business and your products or services. You then use these keywords to create ads that target your potential customers when they search for your products or services on Google.
When a potential customer searches Google using the same or similar keywords, your Google AdWords ads may appear alongside or above the search results as a Sponsored Link, in response to the keywords searched. Your website is now just a click away from your potential customer.