A demo ahead of its time
In a 90-minute demonstration in San Francisco, Engelbart showed the mouse, windows, hypertext links, remote collaboration on a document and video conferencing. In 1968. Most of it only became common decades later.
From Xerox to Apple
Xerox PARC built the Alto computer with a graphical interface and mouse in 1973. Steve Jobs saw it in 1979, and Apple made the mouse cheaper and simpler for the Lisa and the Macintosh.
Evolution
Ball mice had to be cleaned. Around 1999 optical mice arrived with a sensor that photographs the desk surface thousands of times a second. Today there are gaming mice with precise sensors, wireless models and gesture trackpads.