Not sure what the other things are but sampling is basically: real life sound is a continuous wave, but you cannot save a continuous wave to a computer memory, because the memory works like coloring in squares instead of drawing a smooth curve. The smaller the squares you can color are, the higher the sampling rate would be, so you get a better approximation. (Note: the computer memory stays the same, but what higher sampling rate does is it makes a note of where the wave is at shorter and shorter spaces between points.)
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