Interview with Rob Janoff, designer of the Apple logo. On the origin of the bite in the logo:

Anyway, when I explain the real reason why I did the bite it’s kind of a let down. But I’ll tell you. I designed it with a bite for scale, so people get that it was an apple not a cherry. Also it was kind of iconic about taking a bite out of an apple. Something that everyone can experience. It goes across cultures. If anybody ever had an apple he probably bitten into it and that’s what you get. It was after I designed it, that my creative director told me: “Well you know, there is a computer term called byte”. And I was like: “You’re kidding!” So, it was like perfect, but it was coincidental that it was also a computer term. At the time I had to be told everything about basic computer terms.