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CoreOS etched its name in the history of containerized operating systems with its pioneering approach. Founded in 2013, CoreOS quickly gained recognition for its lightweight, container-optimized Linux distribution designed for scalability and security. Its innovative architecture, built around the concept of atomic updates and immutable infrastructure, revolutionized the way developers built and deployed containerized applications. While CoreOS itself is no longer actively developed, its legacy lives on through its contributions to the broader container ecosystem. Today, its technology forms the foundation for several popular platforms, including Red Hat OpenShift, Fedora CoreOS, and RancherOS,