1) According to Facts about Google and Competition, “Every day Google answers more than one billion questions from people around the globe in 181 countries and 146 languages.”
As of August 16, 2013 according to an article on Search Engine Watch (http://searchenginewatch.com/article/2289560/Googles-Search-Market-Share-Shoots-Back-to-67) Google’s market share for searches performed is 67%. So, if 2 out of every 3 people search using Google, that’s a great place to get in front of potential customers.
2) When you create an ad and target the specific keyword phrases that are relevant to your business, Google displays your ads. The user will see your ad next to or above the organic search results.
3) When users see your ad and click on it, you will drive more traffic to your website. More traffic to your website will result in more customers.