Apple II was invented by Steve Jobs and Steve Wosniak and went on sale in June of 1977.
The Apple II was Apple's first mass produced personal computer. It was the first popular personal computer and first colored computer screen.
Apple II was a predecessor of Apple I, which was not as sucessful. Apple II was the first sucessful mass-produced microcomputer.
The Apple II was considered cheap for a computer, but was $2,000 in today's money.