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Security-Enhanced Linux (SELinux) is a mandatory access control (MAC) security mechanism implemented in the Linux kernel. It is designed to enhance the security of Linux systems by allowing administrators to have more control over who can access the system. SELinux can be a bit complex, but with proper understanding and configuration, it can significantly enhance the system's security. In this article, we’ll explore what SELinux is, why it's important, and how to configure it on your Linux system. SELinux was originally developed by the United States National Security Agency (NSA) to implement MAC on Linux.