Could someone explain this?

[acfusion29]

I'm kinda confused.
http://images.apple.com/macbook/images/features_connections20080226.jpg

What's the difference between the Audio and Headphone Jack?

Thanks.

[psychofreak]

The audio one is input

http://docs.info.apple.com/article.html?artnum=303722

[astudentis]

headphone=connect speaker
audio in=connect a microphone for voice coversations (though MB has a built in mic)

[acfusion29]

Thanks guys.