What does GROUND mean?

What does GROUND mean?
In this video we look at different types of ground symbols you may see and why we use different ones. We talk about Earth ground, chassis ground, a generic ground, analog and digital grounds.

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HEY YOU ABOUT TO POST SOMETHING STUPID:
Yes, I know my hands are large/fat. It's because of a heart condition I suffer from called Congestive Heart Failure. Here's a link to some information about CHF: https://cle.clinic/2TdS2Ux
One of the symptoms is that is causes fluid retention, mostly in the hands, feet/ankles, and face..
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Gear I use:
DMM: Owon B33+ - https://amzn.to/3qQgH20
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Bench O'Scope: Hantek DSO5072P - https://amzn.to/3pUl2jL
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