A number system is a way to represent and express numbers using a consistent set of symbols and rules. The most common number system is the decimal system, which uses ten digits (0-9) to represent values. Other systems include the binary system, which uses only two digits (0 and 1), and the hexadecimal system, which uses sixteen symbols (0-9 and A-F). Each system has its own applications, especially in computing and mathematics. Number systems can be classified as either positional or non-positional. In positional systems, the position of a digit affects its value, as seen in the decimal and binary systems. In contrast, non-positional systems, like the Roman numeral system, do not rely on the position of symbols to determine their