Mathematica question

[Petar Mali]

What means

PrecisionGoal\rightarrow 6, WorkingPrecision \rightarrow 10?

Can you explain what here is this numbers 6, and 10?

[Bill Simpson]

http://reference.wolfram.com/mathematica/tutorial/ControllingThePrecisionOfResults.html

http://reference.wolfram.com/mathematica/ref/Accuracy.html

http://reference.wolfram.com/mathematica/ref/Precision.html