It ran a faster 6502 8-bit processor, and used banked memory techniques to address up to 128k of memory (the Apple II familiy was limited to 64k due to that being the limit of its 8-bit address space).
It was a commercial failure, mainly due to the cost and a lack of good programs specifically for it. It had limited Apple II compatibility.
One popular anecdote about the Apple /// is probably better remembered than the machine itself. In a technical bulletin, customers were instructed to lift the machine three inches and drop it - this was supposed to reseat internal DIP chips that had a tendancy to come loose.
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