In division, the remainder refers to the part that is less than one divisor after the divisor is divided by the dividend, that is, the remainder. For example, if we divide 12 by 5, we can get 2+2, which is the sign of remainder in division. The function of remainder is to help us judge whether division is divisible or not and to help us calculate the size of remainder.

Redundancy in division is a concept and symbol that students often encounter in mathematics learning. Usually we use the remainder symbol to represent the remainder after division, judge whether a number is divisible or not, and calculate the remainder. The remainder in division plays a very important role in students' mathematics learning, and students need to know more about it.

The importance of remainder in division is not limited to mathematics learning. In our daily life, we often need to use the related concepts and symbols of division. For example, when calculating the relationship between distance and time, we also need to use the concepts and symbols in division. Therefore, it is very necessary to know the remainder in division. This helps us to improve the accuracy of calculation and let us better apply mathematical knowledge to our daily life.