OS/360
OS/360 is an operating system developed by IBM for its System/360 family of mainframe computers, introduced in the 1960s. It was designed to support a wide range of applications and provided a consistent interface for users and programmers.
One of the key features of OS/360 was its ability to handle multiple tasks simultaneously, which improved efficiency and resource management. It also introduced concepts like virtual memory, allowing programs to use more memory than physically available, paving the way for modern operating systems.