Hi Jenny,
Use All or "INDEX, FOLLOW" if you want
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rebots to include the page in search services and follow links from this page to find other pages.
Use "INDEX, NOFOLLOW" if you want
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the page to be indexed, but do not want the rebot to explore the links from the page
Use All or "NOINDEX, FOLLOW" if you want
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the subsidiary links to be explored but do not want to indexed them
Use "NONE" if you want
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robot to ignore the page
hope this helps, Chiu Chan
cchan@emagine-solutions.com