A decimal fraction is a fraction where the denominator is a power of ten, such as 10, 100, or 1000. This type of fraction is expressed using a decimal point, which separates the whole number part from the fractional part. For example, the fraction 3/10 can be written as 0.3 in decimal form. Decimal fractions are commonly used in everyday life, such as in measurements, currency, and statistics. They make it easier to perform calculations and comparisons. For instance, 0.75 represents 75/100, which is simpler to understand than the fraction itself.