Hexadecimal
Refers to a base 16 number system, which consists of 16 unique symbols: The numbers 0 to 9 and the letters A to F.  In this number system, the decimal equivalent of 10 is A, 11 is B, etc. The hexadecimal system is useful because it can represent every byte as two consecutive hexadecimal digits, and is easier for human to read than binary numbers.

High level
High level is a programming language, such as C, FORTRAN, or Pascal, that enables a programmer to write programs that are more or less independent of a particular type of computer. High level languages are closer to human language and further from machine language. 
["", "", ""]