Linked from
The 8 pages that link to Hexadecimal, each with the reason it gives.
Binary numberCompared with: One hexadecimal digit compactly represents four binary digits.
Hexadecimal colorNarrower topic: Each color channel is written as a two-digit base-16 number.
DigitBroader topic: Its extra digit symbols compactly encode binary data.
BaseBroader topic: Each hexadecimal digit compactly encodes four binary digits.
Binary fileRelated: Hexadecimal notation compactly displays the bytes found in binary files.