The Cisco 2800 Integrated Services Router (ISR) is a series of routers designed for medium to large enterprises and branch offices. These routers offer advanced features for data, voice, and video services, with modular expansion options and support for various WAN technologies. The Cisco 2800 ISR series provides high-performance networking and security with features like built-in VPN support, firewall capabilities, and intrusion prevention. Their modular design allows for scalability and customization, making them suitable for diverse network deployments that require robust performance and comprehensive networking features.