AIX

Stands for "Advanced Interactive eXecutive."

AIX is a proprietary UNIX-based operating system developed and sold by IBM. It was first released in 1986 for use on both workstations and servers, with later versions focused on the needs of enterprise servers. It runs on IBM's Power series of server computers, which are popular in finance, healthcare, and many other industries.

AIX is well-regarded for its stability and robust set of security features. It includes a Live Update feature that allows the kernel to receive updates without rebooting the system or interrupting any services, drastically reducing downtime. AIX is also optimized for resource management, which helps it maintain stability even while the system is under high load. It includes a broad set of security features, including support for encrypted file systems and role-based access control. It incorporates two features, Secure Boot and Trusted Execution, that verify the digital signatures of the system's firmware, scripts, executables, and kernel extensions to prevent malware intrusions.

Since it is now designed specifically for IBM's Power servers, AIX only runs on IBM's POWER series of RISC processors. It integrates with many types of server software to run enterprise software applications, databases, web servers, and development servers. AIX can also run Linux applications that have been recompiled for the platform.