Cisco Systems, Inc. is an American multinational technology conglomerate that develops, manufactures, and sells networking hardware, software, telecommunications equipment, and high-technology services focused on networking, cybersecurity, and AI. Key products include routers, switches like Catalyst and Nexus, Webex for videoconferencing, and security solutions. It holds a leading market position as a worldwide leader in networking infrastructure with a market capitalization of $317 billion as of December 2025.