What is natural number?

What is natural number?

Natural numbers are nonnegative integers
Non negative integers include positive integers and zeros. Natural numbers are also usually non negative integers. Natural numbers are numbers used to measure the number of things or to indicate the order of things. They are numbers 0, 1, 2, 3, 4 We usually use counting units as follows: piece, ten, hundred, thousand, ten thousand, one hundred thousand, etc
Therefore, natural numbers start from 0 (controversial), one by one, and form a set of natural numbers. This is a countable infinite set without upper bound. Mathematicians generally use n to represent it