EMZETT.Red Hat Enterprise Linux
In short: Red Hat Enterprise Linux (RHEL) is the commercial Linux distribution by Red Hat (IBM) for companies.
In more detail: You pay for support, certifications and long maintenance (up to 10 years).
In Depth
Details
Packages in RPM format. The development preliminary stage is Fedora, with CentOS Stream between the two. Rebuilds: Rocky Linux, AlmaLinux.