Sexadecimal is a term used to describe a base-16 numbering system, which often refers to hexadecimal notation commonly used in computing and digital technology. Synonyms for sexadecimal include hexadecimal, base-16, and sixteen. The term is derived from the Latin word 'sex' meaning 'six' and the English word decimal, "counting by tens". The sexadecimal system is used to represent binary values in a shorter format, where each digit can have 16 different values, as compared to the decimal system, where each digit has 10 different values. In programming, hexadecimal notation is used to represent memory address values, color codes, and cryptographic keys.