What is the graphical user interface (GUI) operating system released by Apple in 1984?

The graphical user interface (GUI) operating system released by Apple in 1984 is known as Apple Mac OS. This operating system was groundbreaking at the time for its user-friendly interface, which allowed users to interact with their computers through graphical icons and visual indicators as opposed to text-based commands. The release helped to popularize GUI-based operating systems, influencing the design of future operating systems, including subsequent versions of Mac OS and other platforms.

Macintosh's visual interface set a standard for usability and accessibility that continues to inform the development of operating systems to this day. Apple's focus on the user experience through the GUI made computing more approachable for a broader range of people, thus significantly contributing to the personal computer revolution.