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It’s a streaming (well, actor, but I see it most often used in the streaming context) framework that is pretty well known in the Scala world. It’s pretty robust, and like the comment says, it’s used as the underlying engine for a good amount of high performance Scala and Java frameworks.

Play, which is the pretty much de facto Scala web framework, uses it pretty religiously.

I used Akka many (10?) years ago and back then the landing page and documentation was amazing. It was super clear what it did and why it's necessary. I really enjoyed using it. I'm sad to see such a good project being mismanaged so badly because someone needed to build a company around it.

On https://akka.io or https://en.m.wikipedia.org/wiki/Akka_(toolkit) you get a better idea of what Akka is.