[Haskell-beginners] About Data (was List of all prelude function types?)

[Rustom Mody]

Ive a related couple of questions:

Whats with the word 'Data'? Almost every Haskell module seems to be under
Data.  I dont get exactly the usage of the word.

Also is there some easy way of browsing up and down the hackage hierarchical
structure?
[I know about hoogle and hayoo. I perhaps dont know how to use them well]
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