The Apple II is now 35 years old. Introduced at the West Coast Computer Faire on April 16, 1977, the Apple II was among the first successful personal computers.
The Apple II series (trademarked with square brackets as "Apple ][") is a set of 8-bit home computers, one of the first highly successful mass-produced microcomputer products, designed primarily by Steve Wozniak, manufactured by Apple Computer (now Apple Inc.).
In terms of ease of use, features and expandability the Apple II was a major technological advancement over its predecessor, the Apple I, a limited-production bare circuit board computer for electronics hobbyists that pioneered many features that made the Apple II a commercial success.
Steve Jobs was 22 when he and Steve Wozniak launched the II. It launched the Apple company into a successful business (and allowed several related companies to start).
Throughout the years, a number of models were sold, with the most popular model remaining relatively little changed into the 1990s. By the end of production in 1993, somewhere between five and six million Apple II series computers (including about 1.25 million Apple IIGS models) had been produced.