Beta readers are a different version of Beta testers for computer software.
I belong to the Wannabee Writers Club in The Villages, FL where authors read their work chapter by chapter as they write it. That would be pre-beta. Most members critique from a technician’s point of view. I just realized from this article that I always use the Beta reader point of view.
I am not writing a book. So, I read my articles and it has been helpful. My most common problem: like my boss said, “What is obvious to you is usually not obvious to anybody else.” The club members usually catch that.
After beta readers, you need ARC readers.