Which number system uses digits 0-9 and is also known as base-10?

The Decimal System, also known as base-10, is the numeral system that employs the digits 0 through 9. It is the most widely used number system in everyday life, forming the foundation for standard arithmetic and mathematics. This system is characterized by its combination of positional value, where each position represents a power of ten. For example, in the number 345, the digit 3 represents three hundreds (10²), the digit 4 represents four tens (10¹), and the digit 5 represents five units (10⁰).

In contrast, the Binary System operates on base-2 and utilizes only the digits 0 and 1, making it the fundamental language of computers. The Hexadecimal System, known as base-16, includes digits 0-9 and letters A-F to represent values, effectively expanding the digit set beyond ten. Categorical Data, however, is not a number system at all; it refers to data that can be categorized based on characteristics or qualities rather than numerical values. Thus, the identification of the Decimal System as the correct answer is rooted in its unique use of 0-9 as the primary numerical digits within a base-10 framework.