The Apple Lisa was released in 1983. Its interface was greatly influenced by the Xerox Alto. Steve Jobs and the Lisa team were given two demonstrations of the Alto, after which they implemented the Lisa's interface.
The Xerox Star followed the Alto in 1981. The Star continued the interface style of the Alto and took it a step further. The 72 pixel wide icons had different states when clicked, which were indicated by a change of colour and functioned as feedback to the user.
The Xerox Alto released in 1973 was the first computer that had a graphical user interface. It came with a mouse, bit-map graphics, menus and icons.