**What device is used to connect computers to a network?**
A router is the device commonly used to connect computers to a network. It facilitates communication between different networks, allowing data to be shared among devices connected to the same local network as well as enabling access to the internet. Routers use various protocols to determine the most efficient path for data packets. They can also provide additional features such as firewall protection, network address translation (NAT), and Wi-Fi connectivity to enable wireless devices to access the network.