It will be fascinating to see how Kevin Feige and the staff manage the idea. We've speculated that multiverse is a pleasant, convenient method to incorporate the X-Men and Fantastic Four into the MCU.
Loki, in the same way as any other personality, has multiple variations of himself in various timelines, who perhaps look different from him. We anticipated Spider-Man: Far From Home after which WandaVision present the multiverse into the MCU, however, Loki is the first time we've seen signs that it is here. Loki, a period version, wasn't supposed to escape the Tesseract in Avengers: Endgame, also was supposed to be taken to Asgard because of his imprisonment. These entities are known as time variations.
TVA, as explained previously is an organisation responsible for tracking the multiverse (more on this at another point) for all those entities that perform with the rules decided by the firm, that essentially do what they aren't supposed to. Take this a spoiler alert and return for this article as soon as you've watched the first instalment of this series. The early instalment of Loki has obtained favourable reception from both critics and audiences.