Which device is commonly used to connect a computer to a broadband internet connection?

The modem is the correct device commonly used to connect a computer to a broadband internet connection. It serves as the bridge between your local network and the wider internet. Essentially, the modem translates the digital signals from your computer into analog signals that can be transmitted over phone lines, cable systems, or fiber optics, and vice versa. Without a modem, a computer would not be able to communicate with the internet service provider (ISP) and access the internet.

While a router also plays a crucial role in a network by directing traffic between devices and the internet, it typically requires a modem to first connect to the internet. The switch and hub, on the other hand, are used mainly within local area networks (LANs) to connect multiple devices, but they do not facilitate a direct connection to a broadband internet service. Thus, the modem is essential for establishing that initial connection to broadband internet.