ELI5: How Polygon helps support transactions on Ethereum and if it will continue to do so after ETH2 implementation or will it become redundant?

Note: I posted this in r/cryptocurrency and only received a few responses that were helpful but did not go into much depth. I figure here might allow for a further expansion of ideas. Thanks in advance for any contributions.

I have been reading a lot about Polygon over the past 5 months but have seen significant conflicting arguments and ideas that while good, are extremely technical. Decided to put this out there because I felt it could possibly clarify some ideas about Polygon and how it is currently functioning and what purpose it will serve in the future. Or this will just create further conflicting arguments and information. Either way, I can say that I tried!