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It’s a cache cluster. If you have an expensive query on your database or an api response that’s expensive to generate, you cache it in memory and then for some period of time whenever someone needs it, you return the cached version instead of doing the expensive work. Redis can do a whole lot more than that- data types, documents, etc etc but it’s a web scale caching layer.
I use the cloudflare dns, but there are all kinds of adguard ones too. The Adguard app itself has a big list of options for the fallback.
If you’ve never used adguard, check it out, it can run as a container or on a pi, you just point your router dns at it