Cisco Systems is an American multinational technology conglomerate corporation headquartered in San Jose, California. Integral to the growth of Silicon Valley, Cisco develops, manufactures, and sells networking hardware, software, telecommunications equipment and other high-technology services and products. Cisco specializes in specific tech markets, such as the Internet of Things , domain security, videoconferencing, and energy management with leading products including Webex, OpenDNS, Jabber, and Jasper.