Numeric systems are structured ways to represent numbers using symbols. The most common system is the decimal system, which uses ten digits (0-9) to express all numbers. 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 rules for counting and calculations. Different numeric systems are used in various fields. For example, the binary system is essential in computer science, as computers operate using binary code. In contrast, the decimal system is widely used in everyday life for counting, measuring, and financial transactions.