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A router is an electronic device used in computer networks to direct data traffic between devices on the same network or between different networks. It operates at the network layer (Layer 3) of the OSI model and uses protocols such as ICMP to communicate with other routers and establish the best path for data transmission. In a home or business setting, a router is often connected to a modem to provide wireless internet access to computers, laptops, e-readers, and other devices. The router's firmware can be updated to improve performance, add new features, or fix security vulnerabilities. Additionally, routers can be configured with various settings such as port forwarding, QoS, and firewall rules to customize the network behavior and enhance security. Routers come in different forms, including wired and wireless, and can support a variety of connection types and speeds, making them an essential component for any modern computer network.