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A router is an electronic device primarily used in computing and computer networking to direct data traffic between different networks. It operates at Layer 3 (Network layer) of the OSI model, where it forwards packets based on their IP addresses. Routers are essential components in creating a local area network (LAN), wide area network (WAN), or internetwork, as they enable devices to communicate with each other and share resources over a network. In the context of electronics and computer accessories, routers come in various forms, such as wired or wireless, and offer features like firewall protection, parental controls, and Quality of Service (QoS) management for optimal performance. They serve as intermediaries between computers, servers, switches, modems, and other network devices to ensure seamless data flow and facilitate efficient communication in both home and business environments.