The graphical user interface
People who used computers before the Mac recall how they were all about text -- green, light blue, or amber dot-matrix-style letters on a black background. Building on work at Xerox PARC, Apple changed that, bringing us a screen in which everything was a graphic, including its text. The Mac came with MacPaint, to make fact that crystal-clear. (You can still use the original Mac OS via James Friends' emulation website.)
Today, GUIs (graphical user interfaces) are the norm, whether in Windows, Linux, Android, iOS, and even ATMs, car stereos, and kiosks. Folder icons, trashcan icons, and the desktop concept came from the Mac. Thus, what we see and do on a computer is much more like the real world than before the Mac.