google was first registered on stanford University's domain in 1996. The site was then independently registered in 1997 before becoming a company in 1998. The headquarters for the world's most popular search engine was originally a garage in California. The company quickly advanced and the founders moved to a group of buildings known as the googleplex in 1999. In 2006 Google's headquarters were upgraded again, with the company taking up residence in one of the largest buildings in Mountain view, California. Advertisement sales provide the main source of revenue for the corporation. Google adwords allows companies to buy advertising space from google. Links to an advertiser's websites promoting search-related products are returned in pages showing other search results. Adwords is also quite friendly to users. Results that link to an advertiser's site are clearly separated from other results. The approach has worked brilliantly for the corporation, as both its net worth and number of employees continue to grow.