What is Ground in DC Circuits (GND SIMPLY Explained)

It is common to see GND symbol in all of the electronics and it is necessary for some reasons. In this video, 2 common reasons of those are simply explained through examples.
The sensitive DC circuits always have to be physically connected to the Earth soil along with the metal enclosure of the device through the wall plug. By this way, any kind of EMI noise can be suppressed and if any fault occur (a piece from the circuit touching the metal case) this will save us from getting a serious shock.
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-- Contents of the Video --
00:00 - Intro
00:50 - The First Reason
01:36 - The Most Important Reason
05:09 - Do We Always Need a GND?
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