In ordinary arithmetic, the expression has no meaning, as there is no number which, when multiplied by 0, gives a (assuming a ≠ 0), and so division by zero is undefined. Since any number multiplied by zero is zero, the expression 00 is also undefined; when it is the form of a limit, it is an indeterminate form. (Copy pasted from WIkipedia)
Dividing by 0 is undefined. You can imagine it this way:
You have 0 friends and you have 10 cookies. Now, how many cookies does each friend get? You may think the answer is 0, but it acctually is not! This is because you have NO friends, so therefore there is no way to get an answer.
Now, if you say that you have 10 friends and 0 cookies, each friend will get 0 cookies. This time, we are not dividing by 0, but 0 is divided by us. See the difference?