Dear Haskell supporters,

I have a some question about the definitions in haskell.   

1. What is the use of making definitions compared to having no definitions? Is it just like a comment for documation or does it really make a difference in compiling the code?
2. What does the arrow(->) mean in such a definition? Is it a binary operation as *, +, -, <,>,=   or is it something else? For example there is

sumWithL :: [Int] -> Int -> Int

Does this mean in other words [Int]+Int=Int

3. Why do we use clinches in such definitions. I concluded  you need clinches if a function is not associative

such as (a-b)+c  . (Int->Int)->Int->Int

But also if a higher order function needs more than one argument. (a->b)->c .

Can you please explain it ?

Thank you

Kind regards.

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