The "Mother of All Demos" refers to a groundbreaking presentation given by Douglas Engelbart on December 9, 1968. During this demonstration, Engelbart showcased innovative computer technologies that laid the foundation for modern computing, including the use of the mouse, hypertext, and collaborative software. This event took place at the Fall Joint Computer Conference in San Francisco and featured a live connection to a computer in Menlo Park. Engelbart's vision of augmenting human intelligence through technology was revolutionary, influencing the development of personal computing and the internet as we know it today.