What is the primary function of a router in a network?

The primary function of a router in a network is to connect multiple networks. A router serves as a gateway that routes data packets between different networks, allowing devices from various subnets to communicate with each other. When data is sent across the internet, it travels between different networks, and the router facilitates this process by determining the best path for the data to reach its destination. This is particularly critical in home and enterprise networks where the router connects local area networks (LANs) to wide area networks (WANs) or the internet.

Additionally, routers often come equipped with features that allow them to manage traffic efficiently, prioritize data to maintain quality of service, and implement security measures to protect network integrity. However, the core functionality focuses on interconnecting diverse networks and ensuring seamless communication between them. This distinguishes routers from devices with other roles, such as storing data or managing installations, which do not align with the primary purpose of what a router is designed to do.