I know this may be a very basic question, but confusing me.

If I write the following for example in the controller:

@x = App.new(params[:x])

I know that I'm trying to create a new object here, but how can I read
the params[:x] part.

I know also that "params" is a Hash table in the controller, but what is
the following statement trying to say when passing [:x] to params? What
is this value?
>From where will I retrieve it?

Thanks.
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