What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?

I know Scope_Identity(), Identity(), @@Identity, and Ident_Current() all get the value of the identity column, but I would love to know the difference.

Part of the controversy I’m having is what do they mean by scope as applied to these functions above?

I would also love a simple example of different scenarios of using them?

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