In mathematics, "product" refers to the result of multiplication of two or more numbers. When we say the product of two numbers A and B, we mean the result of multiplying A by B, which is marked as A× B. For example, the product of 3 and 4 is 12, because 3×4= 12. This concept can be extended to multiply more numbers, for example, the product of three numbers A, B and C is a×b×c C C. In our daily life and mathematics study, we often encounter quadrature, such as calculating area and volume, which all involve the product of numbers. It is worth noting that "product" is different from "sum". Sum refers to the result of adding two or more numbers, such as A+B. In mathematics, it is important to distinguish these two concepts.