The difference between AccuracyGoal and PrecisionGoal

What is the difference between AccuracyGoal and PrecisionGoal for NIntegrate?

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I think this suggestion from the Mma help system is almost enough:

With PrecisionGoal-> p and AccuracyGoal-> a, Mathematica's attempts to make a numerical error into a result of size x will be less than (10 ^ -a) + Abs [x] 10 ^ -p.

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