Oracle Corporation is an American multinational computer technology corporation, headquartered in Redwood City, California. The company primarily specializes in developing and marketing database software and technology, cloud engineered systems and enterprise software products—particularly its own brands of database management systems. In 2011 Oracle was the second-largest software maker by revenue, after Microsoft. The company also develops and builds tools for database development and systems of middle-tier software, enterprise resource planning (ERP) software, customer relationship management (CRM) software and supply chain management (SCM) software.