Answer: If the result of the operation of two numbers does not exceed the range of the word length, the carry generated is a natural carry; if the result of the operation of two numbers exceeds the range of the word length (that is, the result is unreasonable), it is called overflow. For example, if the positive number 3FH and the negative number D0H are added, the result will not exceed the range of the 8-bit word length, so the carry in the result 10FH is a normal carry (that is, modulo). However, if the positive number 3FH is added to the positive number 70H, the result is AFH, and the highest bit is "1", which means a negative number, which is unreasonable. This situation is called overflow.
Reference address：What is carry and overflow
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