What is mean by datum iin gd&t?

How its classifieds?

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A Datum is a plane, axis, or point location that GD&T dimensional tolerances are referenced to. Typically, multiple features will be referenced by each datum, so they're a very important part of the whole thing. Datums tell us where to measure from.

In the drwaing below, A and B are the Datums used to establish the center of the hole using the Position Symbol and the Feature Control Block for the hole center..

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Datums basically are surfaces, axis or points with zero tolerances.
Everything are measured with respect to a datum in engnn drawings.

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