CentOS

In short: CentOS was a free rebuild of Red Hat Enterprise Linux.

In more detail: CentOS Linux was discontinued at the end of 2021 (CentOS 8). Successors in the sense of a rebuild are Rocky Linux and AlmaLinux.

In Depth

Details

CentOS Stream continues to exist but is the upstream of RHEL. See Fedora.

See also: Linux, Debian, Ubuntu, Fedora