Theory with audio cables

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3.5mm stereo jack
“Mini jack”
Used on headphones, mobiles and tablets

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Phono/RCA Plugs
Used on speaker systems, sound bars, Xbox, Playstations, DVD players

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6.3mm jack
“1/4 inch jack”
Used with Guitars, amplifiers, and mixers

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Music file

All audio files are different here is a few:-

.wav file
Uncompressed with the highest quality but is the largest of the audio files.

.mp3 a compressed file with lossy data for a good quality and a smaller sized file.

.Flac file
A compressed file with lossless data with a better quality with an average file size.