A natural number is a positive integer that is used for counting and ordering. These numbers start from 1 and go on indefinitely: 1, 2, 3, 4, and so forth. Natural numbers do not include negative numbers or fractions, making them fundamental in mathematics.
In some contexts, the set of natural numbers may also include 0, which is known as the whole numbers. Natural numbers are essential in various fields, including arithmetic, number theory, and everyday counting tasks. They form the basis for more complex mathematical concepts and operations.