What is the function of a router?

The primary function of a router is to forward data packets between computer networks. Routers are essential devices in a network setting as they determine the best path for data to travel across interconnected networks, such as the internet and local area networks (LANs). By analyzing the packet information, routers make intelligent routing decisions based on the destination IP address, network policies, and routing tables, which enhances network efficiency and reliability.

In contrast, other options describe functions that do not align with the role of a router. Storing large amounts of data is typically the function of network storage devices, such as servers or hard drives. Connecting directly to a computer's hard drive relates more to internal components or storage devices rather than networking hardware like routers. Running software applications is specifically the role of computers or servers, not routers, which are designed primarily for network management and traffic routing.