Whats the difference between a buffalo and a bison?

I know one is extinct, and the other they make steaks out of. I know one was killed off by people for sport, riding around on trains in the mid-west. Do they look identical? Is a bison the species and the buffalo a sub-species. Also, why am I asking people who have never even seen a real buffalo just like me. ... show more I know one is extinct, and the other they make steaks out of. I know one was killed off by people for sport, riding around on trains in the mid-west. Do they look identical? Is a bison the species and the buffalo a sub-species. Also, why am I asking people who have never even seen a real buffalo just like me. Hey, scientist's and experts only please. Just kidding, just let me know what you think I suppose and please back it up with proof if your not to lazy or duh.
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