Red Hat developers have begun creating builds of CentOS Stream 9, a continuously updated edition of CentOS, on the basis of which the development of the Red Hat Enterprise Linux 9 branch began. CentOS Stream allows earlier access to the capabilities of the future RHEL branch, but includes packages that are not yet fully stabilized. CentOS Stream 9 builds are being generated for the x86_64, Aarch64, ppc64le and s390x architectures, but so far only in the form of images for isolated containers.
CentOS Stream was created to enable third-party community members to participate in the development of a new branch of RHEL. CentOS Stream can be considered as an upstream project for RHEL, serving as the basis for its development. Third-party participants can control the preparation of packages for RHEL, propose their changes and influence decisions made. Previously, a snapshot of one of the Fedora releases was used as the basis for a new RHEL branch, which was finalized and stabilized behind closed doors, without the ability to control the progress of development and decisions made. The new development process involves moving the previously closed stage of preparing RHEL to CentOS Stream - based on the Fedora snapshot, with the participation of the community, a new CentOS Stream branch is being formed, after which RHEL will be rebuilt based on CentOS Stream.
Source: opennet.ru