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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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: 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+ - amzn.to/3qQgH20
Power Supply: Matrix 3206 - amzn.to/37C0fL9
Portable O'scope: YEAPOOK ADS1013D - amzn.to/2ZG4G3x
Bench O'Scope: Hantek DSO5072P - amzn.to/3pUl2jL
Soldering Station - KSGER T12 - amzn.to/2NuNdby
Multimeter leads: Probemaster - amzn.to/2ZJ0BLK