Decimal notation is a way of representing numbers using a base-10 system, which includes ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. In this system, the position of each digit determines its value, with each place representing a power of ten. For example, in the number 345.67, the digit 3 is in the hundreds place, 4 in the tens place, 5 in the units place, and so on. Decimal notation also allows for the representation of fractions using a decimal point. The digits to the right of the decimal point indicate values less than one. For instance, in the number 0.75, the 7 represents seven-tenths, and the 5 represents five-hundredths. This system is widely used in mathematics, science, and everyday life for its simplicity and clarity.