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Binary →
Binary extends hexadecimal in that binary provides a more detailed understanding of machine and computer operation, yet hexadecimal codes are often used to represent binary computer codes, for they are easier for human interpretation.
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Radix →
Hexadecimal provides a concrete, binary-aligned base (16) that makes the abstract notion of radix actionable in code, enabling base selection, conversion, and interpretation in contexts like memory addresses, byte dumps, and color codes.