The audio cables shown above connect multimedia drives like a CD-ROM or DVD-ROM to a sound card.
They allow the transfer of sound data to the sound card so that it can be decoded and played.
The quality of a computer's sound depends primarily on the sound card and speakers. The 4 pin, (or wire),
audio cable is for analog audio. The two pin, (or wire), audio cable is for digital audio. Analog audio
is continuous. Digital audio is broken into pieces. The sound card takes digital audio and translates
it into analog audio and vice-versa. The reason for this is that computers work with digital data and
regular sound waves are analog signals. Analog audio is like the sunlight, with continuous light. Digital
audio is like a strobe light, with rapid bursts of light. You could also think of analog like signing
your name in cursive, with one smooth continuous line. Digital would be like typing your name, doing
it one keystroke at a time. Audio cables are not normally required with later model computers.