Actually...it's undefined.......to see why, note that
6/2 = 3 because 3 x 2 = 6
But what is 10/0 ???
It can't be 0, because that would imply that 0 x 0 = 10....which is impossible.
In fact, 0 x anything can't be anything other than 0 !!!
This is why we can't divide by 0.