Summary 📝

Hexadecimal (base 16) is used in computer science because it is a shorter and simpler way of representing binary numbers. Computers use binary (0s and 1s), but long binary numbers can be difficult for humans to read and understand. Hexadecimal groups binary into sets of four bits, making it easier to convert and much more readable. For example, the binary number 11110000 becomes F0 in hexadecimal. 

It is commonly used in error messages, colour codes in web design, and memory addresses. Hex is especially useful when debugging code or working closely with low-level data, because it provides a human-friendly way to look at binary values. 

Each hex digit represents exactly four bits, so converting between binary and hexadecimal is quick and accurate. This saves time and reduces mistakes when working with binary data. 

Key learning Points 📌

• Hexadecimal is base 16, using digits 0–9 and letters A–F.

• It is used because it's easier to read and write than long binary strings.

• One hex digit = 4 binary digits (bits).

• Hex is used in memory addresses, colour codes (like in HTML), and machine code.

• Converting between binary and hex is quicker than binary to decimal.

• It helps programmers debug more easily by reducing visual complexity.

• Examples:
  
  

Binary 1101 0100 = Hex D4
HTML colour #FF0000 = Bright red

• Hex reduces errors when reading or copying binary numbers.