This document provides an overview of Cisco Systems, including: - Cisco was founded in 1984 by computer scientists from Stanford University who invented technology to link computer systems. - Cisco is headquartered in California's Silicon Valley and had around 73,000 employees in 2018, generating $49.3 billion in revenue. - Cisco offers a wide range of networking products and services, including routers, switches, security, firewalls, telepresence, data center services, and wireless. They also operate the Cisco Networking Academy program.