Real number is a general term for rational number and irrational number. [1] Mathematically, real numbers are defined as numbers corresponding to points on the number axis. Real numbers can be intuitively regarded as one-to-one correspondence between finite decimals and infinite decimals, and between real numbers and points on the number axis.

Integer is a number like -3, -2,-1, 0, 1, 2,3, 10.

All integers form an integer set, which is a number ring. In the integer system, zero and positive integers are collectively called natural numbers. -1, -2, -3, …, -n, …(n is a non-zero natural number) are negative integers. Positive integers, zero integers and negative integers form an integer system. Integers exclude decimals and fractions.