https://thenewstack.io/red-hats-new-linux-distro-brings-centos-closer-to-rhel/

What Is CentOS Stream?

According to Red Hat CTO Chris Wright, “CentOS Stream is a developer-forward
distribution that aims to help community members, Red Hat partners and others
take full advantage of open source innovation within a more stable and predictable
Linux ecosystem. It is a parallel distribution to existing CentOS, which this morning
saw the release of CentOS 8.”

What, exactly, does that mean? Simply put, CentOS Stream is an upstream development
platform for ecosystem developers, that serves as a single stream of content which is
updated several times a day. These updates will encompass the latest/greatest from
the RHEL codebase, to give ecosystem developers a firsthand view into what the next
version of Red Hat Enterprise Linux will look like.