What is a denominator?

A denominator is a part of a fraction that appears below the line, and it shows the total number of parts into which something is divided. The denominator indicates how many equal parts a whole has been divided into and each part's size. For instance, in the fraction 3/5, 5 is the denominator, which specifies that the whole is divided into 5 equal parts. The denominator cannot be zero since division by zero is undefined. Additionally, the denominator must be a positive integer since fractions cannot have a negative or non-integer denominator. It is also worth noting that the denominator of a mixed number refers to the number of equal parts comprising the fractional portion of the mixed number.