What is 'off by one' bug ?

Can anyone explain what this bug is ?

BTW, I am VB programmer Intrigued by the term.

http://www.tuxedo.org/~esr/jargon/ht...one-error.html

Those crazy hippies will come up with a name for anything.

:p

Haha, you're right, crptcblade. I never knew there was a name for that. I always called it "oh ****" when I realized I was doing it.