What is Hexadecimal?
Hexadecimal (base 16) uses digits 0-9 and letters A-F to represent values 0-15 in a single character. One byte (8 bits) is represented by exactly two hex digits. "Hello" in hex is 48 65 6C 6C 6F.
Common Uses of Hex
Color codes: #FF5733 in CSS — each pair represents Red, Green, Blue. Memory addresses: 0x7FFF in programming. Unicode: U+0041 is the hex code for 'A'. CTF competitions: Hex encoding is used in security challenges.
How do I read hex color codes?
#RRGGBB — first two digits = Red, middle two = Green, last two = Blue. #FF0000 = pure red, #00FF00 = pure green, #0000FF = pure blue, #FFFFFF = white, #000000 = black.