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The hexadecimal number system (base 16) is a compact, structured way to represent binary data. It uses sixteen symbols — 0–9 and A–F — where A equals 10 and F equals 15. While decimal (base 10) is convenient for humans, and binary (base 2) is native to machines, hexadecimal acts as a highly efficient bridge between them.

Understanding what is hexadecimal used for reveals a deeper principle: modern computing relies on representations that balance readability, precision, and direct compatibility with binary architecture.