4.0 Spec critique of forms discussion

Hello, 

I'm attempting to learn HTML and the various incarnations of it (scripting,
etc.) and I'm stuck on the "Forms" discussion, about the difference between
'get' vs 'post' vs 'submit'. It isn't very useful to define something using
the same word that you are defining. 'Get' gets the info, 'submit' submits
it. This is not at all helpful. What does "submit" do? How do you contrast
that with "post"? And how is that different from "get"? I don't know after
reading the 4.0 draft.

Russell Hires

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  _its_ (no apostrophe) means "the thing that it owns"
  _it's_ (with apostrophe) means "it is"