VMware makes a virtue of being virtual. The company develops software used to create and manage virtual machines -- computer functions spread across multiple systems. Companies use its applications to more efficiently integrate and manage server, storage, and networking functions in order to lower the cost of operating their IT systems. VMware also provides an extensive range of consulting, technical support, training, and certification services that accounts for more than half of sales. The company has marketing relationships with top computer hardware vendors, including Hewlett Packard Enterprise, IBM, and Cisco Systems. Dell Technologies holds a controlling stake in VMware through its acquisition of EMC.