People usually write numbers in computers in hexadecimal instead of binary because hexadecimal is more convenient to write than binary.
Hexadecimal (abbreviated as hex or subscript 16) is a carry system in mathematics that bases 1 on every 16. Generally represented by numbers 0 to 9 and letters A to F (or a~f), where: A~F means 10~15, these are called hexadecimal numbers.
Binary (binary) refers to a numbering system based on 2 as the base in mathematics and digital circuits. Using 2 as the base means that the system is binary. In this system, it is usually represented by two different symbols: 0 (representing zero) and 1 (representing one). In digital electronic circuits, the implementation of logic gates directly uses binary, so modern computers and computer-dependent devices all use binary. Each number is called a bit (Bit, short for Binary digit).
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