Which of the following devices is used to connect a computer to a Wi-Fi network?

The Network Interface Card (NIC) is the correct choice because it is the hardware component that enables a computer to connect to a network, including a Wi-Fi network. In the context of wireless networks, a wireless NIC or WLAN card is specifically designed to communicate with wireless access points or routers, allowing the device to send and receive data over a Wi-Fi connection. This functionality is essential for establishing wireless network connectivity for desktop computers, laptops, and other mobile devices.

While other devices like modems and routers are integral to the overall network setup, they serve different purposes. A modem connects to the internet service provider to bring internet access into a home network, while a router manages the traffic between the internet and the individual devices, creating a local network. A switch, on the other hand, is used to connect multiple wired devices within a local area network but does not facilitate Wi-Fi connections.

Thus, the specific role of the NIC in enabling wireless communication clearly makes it the core component for connecting a computer to a Wi-Fi network.