Can someone explain to me,the most common types of neck profiles and how you can tell which is which?

Im always seeing "c shape" and "d shape" but i never know what it means.
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I think C shape is most common... but don't quote me on that. It's either D or C, though.

Here's a pic on the shapes:

C is the most common, I like D better though. I can't stand super thin necks like Wizards.
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cool neck chart

are Dean guitars shaped like the hard v or medium v?
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cool neck chart
There was a thread just like this about a week ago. Someone posted that chart, so i saved it. I knew i'd need it again one day.