A microphone is a source that sends an output to its male plug.
A loudspeaker is a load and receives an input at its female plug..
Input, because a microphone can capable of detecting sound.
A microphone is an input device.
A Microphone does not output sound. It accepts sound. It is an input device.
Input Device, It converts audio signals into digital signals & feeds them to Computer.
input input. The microphone gives a signal to the computer/radio/whatever you're using