Howdy. I'm considering a Mac Mini for home use. Never owned a Mac before. Primarily web surfing and playing DVDs, CDs etc. And some just Mac curiosity

Anyway, I've been reading posts for a few weeks now. Audio specs say:
Combined optical digital audio input/audio line in (minijack)
Combined optical digital audio output/headphone out (minijack)
Will this play 5.1 surround? What are some of my options for best sound? I do not have a stereo system to tie it into ... even if I could ...
Any info/links are appreciated .