what is GT&D

i was beginner in creo & soildworks software. i dont know what is gt&d..
please explain gt&d with examples

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Geometric dimensioning and Tolerance is nothing but a technical language to communicate between engineers.i.e., when you hand off a drawing to machinist, there will be a lot queries like which surface must be given weightage, whether any envelope condition( mating part) should developed at patricular tolerance etc where this GD &T reduces the query unnecessary query gap. Also they are used to eliminate errors.

 
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