How many digits does the base 10 number system consist of?

The base 10 number system, also known as the decimal system, consists of ten unique digits that are utilized to represent numbers. These digits include 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. The significance of this system lies in its position-based notation, where the value of a digit depends on its position in relation to the decimal point. Each digit can represent different values depending on its placement (units, tens, hundreds, etc.).

In contrast, other number systems mentioned in the options utilize fewer or greater digits. For example, the base 8 system, known as octal, uses only eight digits (0 through 7), while base 16, or hexadecimal, consists of sixteen digits (0 through 9 and A through F). The base 12 system, typically less common, includes twelve distinct symbols (0 through 9 and two additional symbols for ten and eleven). The base 10 system's ten digits are fundamental to its structure and usage in everyday mathematics and calculations, making it the most widely adopted numeral system in the world.