What is an advantage of using a modem in communication?

Using a modem in communication offers the significant advantage of converting digital signals to analog. This conversion is essential for enabling devices to communicate over traditional telephone lines, which transmit information in an analog format. Digital signals, produced by computers and other digital devices, need to be transformed into analog signals that can travel over these lines. The modem takes care of this process through modulation, allowing data to be sent and received effectively across various communication mediums.

While other options may suggest potential benefits, they do not accurately reflect the core functionality of a modem. Voltage spike protection, battery life enhancement, and signal frequency improvement are not primary roles of a modem, making the conversion of signals its most pertinent advantage. This function is crucial for establishing connections in many networking environments, particularly when integrating modern digital technology with legacy analog systems.