SPDIF output how to use?

on my laptop i enjoy two 3.5mm ports for headphones. beneath the right one there is a logo of SPDIF

can someone backing me how to use tht?
does it give better nouns quality
however i can use my earphones on the SPDIF port,,,

i have a 5.1 surround system which give three 3.5mm out and i'm supposed to connect this to my sound card.i modified the wires into 1 3.5mm rope and plug it in the port.same nouns quality as the other headphone output on my laptop.

someone assistance me
i want to use the SPDIF and is it better?

i have an HP dv6110ca
dual core 64bit
2048 mb of bump
256mb graphics

Answer:
SP/DIF = Digital

3.5mm = Analog
SPDIF (Sony Phillips Digital Interface) generally used within home theater connections

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