CWE-343 Divide By Zero error is an error that occurs when the divisor (the number being divided by) is equal to zero. This can happen in mathematical calculations, when trying to open a file that does not exist, or in other cases where the divisor should not be zero.

When this error occurs, it is usually because the programmer has not accounted for the possibility of a zero divisor and has not written code to handle this case. This can lead to unexpected results or crashes. To avoid this, it is important to check for divisors that may be zero before performing division operations and to handle this case gracefully.