Both. Modem stands for
MOdulator DEModulater.
Modulator comes from modulation which is the process of converting analogue data to digital for transmission and Demodulator from Demodulation, converting digital signals to analogue.
Digital data-discrete or non-continuous data
Analogue data- continuous or non-discrete data
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A modem is both an input and an output device.
The name modem comes from Modulator Demodulator.