Learn how Google works
Search is about giving people the answer they’re looking for—whether it’s a news article, sports score, stock quote, a video or a map. Google’s search engineers design algorithms that analyze millions of pages and return timely, high-quality, relevant answers to people’s questions. More information about Google Web Search.
What about ads?
Search results (sometimes called "organic" results) appear in the middle of the Google.com results page, and are never paid for. Paid ads appear on the right hand side and sometimes at the top, and are always clearly labeled.
Google maintains a strict separation between our search business and our advertising business, and doesn't give special treatment to our advertisers. Our view is that if we provide the best search results, people will continue to choose to use Google over other search engines. More information about ads.
Google's committed to transparency. That's why we created Webmaster Tools: to give webmasters as much information as we can about how we crawl and index sites. More information about transparency.