Form Helper X Form Builder. What's the difference?

I'm Brazilian... Sorry for my English errors of type.

I need to make a form helper, but I'm confused. I would like to 开发者_如何学运维know the difference between a Form Helper and a Form Builder.

Hallo.

As far as I can gather 'builders are a kind of helper'

That's not a very useful answer, and I'd be grateful if anyone else can provide a better one.