What device can be used to convert a signal between analog and digital formats?

A device that can convert signals between analog and digital formats is known as a modem. Modems serve as a bridge between analog signal systems, like telephone lines, and digital data used in computers and networks. For example, when data is sent from a computer, it is in digital format, and the modem converts that digital data into an analog signal for transmission over traditional telephone lines. On the receiving end, the modem converts the incoming analog signals back into digital format for the computer to process.

In contrast, a router primarily directs data packets between networks and does not inherently convert between analog and digital signals. A switch operates within the same digital domain, handling data packets between devices on a network without engaging in any signal conversion. An access point facilitates wireless connections and does not perform any signal conversion tasks related to analog and digital formats. Understanding these functionalities clarifies why the modem is the correct choice for converting signals between analog and digital.