X Window System (X11)

The X Window System, often called X11, is a framework used primarily on Unix and Linux systems for creating graphical user interfaces. It enables software applications to display windows, manage colors, and handle input from devices like keyboards and mice. X11 allows applications to run on one computer while displaying output on another, facilitating remote work. It supports multitasking, letting users run multiple programs at once in separate windows. Essentially, X11 provides the foundational technology for graphic environments in many operating systems, making it possible to interact visually with computer software.