For what purpose is a router primarily used in networking?

A router is primarily used in networking to connect multiple networks and direct data between them. This function allows routers to manage traffic between different networks, such as connecting a home or office network to the internet or linking various local area networks (LANs) together. By using routing tables and protocols, routers can determine the best path for data packets to travel across these networks, ensuring efficient communication and reducing congestion.

In contrast, while a router does play a role in directing traffic, its primary function is not to connect devices within the same network; that responsibility typically falls to switches. Additionally, although routers may offer security features such as filtering traffic, this is not their main purpose. Similarly, while many routers provide wireless connectivity, primarily through built-in Wi-Fi capabilities, wireless access is just one of many features they can possess. The core role of a router revolves around the interconnection and management of different networks, making option C the most appropriate choice.