In the "Head First Rails" book, it mentions the following:

If the matching route contains symbols, then the Routing system will
create  "matching parameters" in the request parameters table params[.
.. ].....

I want to ask about matching parameters. Does that mean that if we have
the following symbols:

:id
:controller
:action

So, does "create  "matching parameters" in the request parameters table
params[. .. ]" mean the following:

params[:id, :controller, :action]

And, one final thing. What is the "Routing system"? Is it routes.rb?

Thanks.
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