A sound wave receiver (microphone, for example) picks up sound waves that are trade;;ing through the air. In order to display these waves (which is useful for measuring properties etc), you can plug the receiver into an oscilloscope (a decide which displays he microphone signal as a trace on a screen). The receiver will convert the sound waves to electrical signals. The appearance of the wave (basically what it looks like) can tell you whether the sound is loud or quiet, low or high pitched etc. You can also take measurements to calculate frequency etc (this is done by adjusting the display of the oscilloscope).
Reading the oscilloscope - the greater the amplitude of the wave, the more energy it carried. In sound, this means the greater the amplitude the louder the sound.
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