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What the purpos of the Capacitor ?

Hello everyone.

My question is :

In this circuit What the purpos of the Capacitor ?



Thank you

Picture of What the purpos of the Capacitor ?
TO keep the supply clean for the IC
I certainly hope its 100 uF and not 100 MF...I want to know where people are getting megafarads in a 3V circuit :D

Old, particularly American circuits seem to use Mf for microfarad, like the American 'mil' is a thousandth of an inch !!