I tried to find official information about Amazon Linux but I can't find. Is it based on what distro? (maybe RHEL7 but not mentioned) How it's compatible to EPE

I tried to find official information about Amazon Linux but I can't find. Is it based on what distro? (maybe RHEL7 but not mentioned) How it's compatible to EPEL and other software for RHEL even though they are different from RHEL? (at least they uses different glibc version) I'm really curious whether Amazon Linux is accepted by Linux guru or not. It seems that there are very little docs for a distribution.