We can never blast out the highest quality versions of audio, video, or images because it is unnecessary and it’s too much data for normal consumer equipment to process live. Hence, data produced must be simpler and take up less bandwidth. However, when we down-convert, we lose details as well as introduce errors. Dithering is a process to smooth out those errors.
Dither is an intentionally applied form of noise used to randomize quantization error. The errors we get when converting our recordings to lower quality bit rates causes the waveform to shiver, and the algorithms used to do the conversion can be indecisive.
Read more about this here: https://ledgernote.com/columns/mixing-mastering/dithering/
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