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What is the remainder?
In mathematics, when an integer is not divisible by another integer, the part that is not divisible is called remainder. For example, if 17 is divided by 5, the quotient is 3 and the remainder is 2, because 17 = 5 × 3+2.

The remainder can be represented by the symbol "%",for example, 17% 5 = 2. In computer programming, the operator for finding the remainder is usually "%".

The rest have many important applications. For example, in modular operation, the remainder can represent the full equivalence of an integer in a certain number, and can also be used to judge whether a number is divisible by another number and calculate the value of a polynomial.