Decimal system: The decimal system is a number system that uses a base of 10. It includes the digits 0-9 and each digit's value is determined by its position within the number.
Octal: Octal is a number system that uses a base of eight, consisting only of the digits from 0 to 7.
Hexadecimal: Hexadecimal is a number system that uses a base of sixteen, consisting of the digits from 0 to 9 and letters A to F.