Error on integral due to numerical integration?

I was wondering: to compute the integrals of functions, Root must be using a numerical method.
So there’s an associated uncertainty due to the nature of the approximation.

Is this too small to have an effect on the final result?
What numerical method does root use to perform the integral (eg fnct->Integrate(limit1, limit2) )?

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TF1::Integral (Double_t a, …)
TF1::IntegralError (Double_t a, …)

TF1::IntegralMultiple (Int_t n, …)
TF1::IntegralError (Int_t n, …)