A modem is connected between a telephone line and a computer or other networked device. The term "modem" is a combination of "modulator" and "demodulator," and it serves to modulate digital data from a computer into analog signals for transmission over telephone lines and demodulate incoming analog signals back into digital data for the receiving computer. This allows digital devices to communicate over analog telephone lines, which were traditionally designed for voice communication. So The right answer is computer for question number 16.