In a fraction, the denominator is the bottom number that represents the total number of equal parts into which the whole is divided. It indicates the total number of parts in the whole and also the size of each of those parts.
For example, in the fraction 3/4, the denominator is 4. This means that the whole is divided into 4 equal parts, and each part is one-fourth of the whole.
The denominator is important because it helps us understand the relative size of the parts in the whole. It is also necessary for performing operations like addition, subtraction, multiplication, and division of fractions.