A modem can be used for sending (output) and/or receiving (input).
A modem (Modulator-demodulator) is both. It allows you to input data (download) and output data (upload).
I believe it is both an input and an output device, but I will check
It is both an Input and an Output device.
A modem is one of those devices that is both an input and an output device.
A keyboard is an input device. A modem is both an input and an output device. A CPU is the central processor and is connected to both input and output devices but is itself neither.
both
An input output device that modulates and demodulates is a modem.
communication
Data flows through the modem both ways.
Neither, it is not classified under input or output. It has its own identity
MODEM Stands for MOdulator DEModulator. It acts both as an input & output (SIGNAL) as it converts incoming analog signals to digital and viceversa. Incoming - while downloading. Outgoing - while uploading.
levers are classified by the locations of the input and output forces relatively to the fulcrum