A router is a device that is used to transmit data between multiple networks. It receives data packets from connected devices, examines the packet's data and decides where to send it, translating the packet if needed. Routers effectively manage the flow of data, ensuring that packets are routed to where they need to go and that data is not lost or corrupted.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Summarize the function of a router.

### Response:
A router is a device that is used to transmit data between multiple networks. It receives data packets from connected devices, examines the packet's data and decides where to send it, translating the packet if needed. Routers effectively manage the flow of data, ensuring that packets are routed to where they need to go and that data is not lost or corrupted.
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A router is a network device that connects and directs traffic between different networks, subnets, and devices on a local area network (LAN) or wide area network (WAN). Its primary functions include:

1. **Routing**: Routers determine the best path for data to travel between networks, using routing tables to select the most efficient route.
2. **Addressing**: Routers assign and manage IP addresses, ensuring that data is delivered to the correct destination.
3. **Switching**: Routers forward traffic to the appropriate destination switch, which then forwards the traffic to the final destination device.
4. **Quality of Service (QoS)**: Routers can prioritize traffic based on criteria such as speed, latency, and reliability to ensure critical applications receive adequate service.

Overall, the primary function of a router is to facilitate communication between different networks and devices, ensuring that data is delivered efficiently and reliably.