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Counting using 16 digits (0-9 and A-F). One hex digit packs four bits.
A base-16 number system where the digits A-F represent 10-15. Each hex digit corresponds to exactly 4 bits, so two hex digits represent one byte. Common in colors (#FF8800), memory addresses, and binary file dumps.
Positional notation with radix 16. Native to systems programming because the byte boundary aligns cleanly with two hex digits, simplifying inspection of memory, opcodes, and register contents.