Decimal fractions are numbers that represent parts of a whole using a decimal point. They are written in a way that shows how many tenths, hundredths, thousandths, and so on are present. For example, the number 0.75 represents 75 hundredths, which can also be expressed as the fraction 75/100. In everyday life, decimal fractions are commonly used in measurements, currency, and statistics. They make it easier to perform calculations and compare values. For instance, when shopping, prices like 3.99 or 2.50 help us understand how much we need to pay, allowing for quick comparisons between different items.