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A router is an electronic device used in computer networks to connect multiple devices together and enable communication between them. It operates at the network layer (Layer 3) of the OSI model, using protocols such as IP to route data packets between devices. In a home or small business setting, routers typically provide wireless access points for Wi-Fi enabled devices, such as laptops, smartphones, and tablets. Routers can also include features such as firewalls, virtual private networks (VPNs), and quality of service (QoS) controls to enhance network security and performance. They are an essential component of any computer network, providing the means for devices to communicate with each other and access the internet.