We don't know...yet!
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**Marvel have not yet clarified what any or all of these terms mean for *them*.**

Indeed Marvel haven't commented at all but rather the various creators, such as the Russo Brothers have used the terms but again, have failed to **define** them.

Given the, ahem, *issues* with in Captain America, Loki (and possibly others) in *Endgame* and the revelation that there are **other Earths** in *Spider-Man: Far From Home* this has yet to be explained.

It's likely that Phase 4 and forthcoming/proposed Disney+ productions (*VandaVision, Loki series, Winter Soldier & Falcon series and What If? * etc.) may explore this further.