Oracle Corporation is a multinational computer technology corporation that specializes in developing and marketing enterprise software products — particularly database management systems. Headquartered in Redwood City, California, United States, Oracle employs more than 115,000 people worldwide as of 2009. It has enlarged its share of the software market through organic growth and through a number of high-profile acquisitions. By 2007 Oracle had the third-largest software revenue, after Microsoft and IBM.