Douglas Engelbart’s 1968 demo, known as “The Mother of All Demos,” was a huge moment in computing history. He introduced key technologies like the mouse, hypertext, and early versions of windows—all things we use daily now. He even showed video conferencing and real-time collaboration, way ahead of its time. This demo shaped how we think about interacting with computers and paved the way for personal computing and the internet. It’s one of the reasons modern UX and interaction design exist today.