What type of numbers are expressed using base 2?

Numbers expressed using base 2 are known as binary numbers. In the binary system, only two digits are used: 0 and 1. This system is fundamental in computer science and digital electronics because it directly corresponds to the on/off states of electronic circuits.

The binary system is essential for representing data in computing, as it forms the basis for all types of computer data storage and processing. Each binary digit (or bit) can represent an increasing value based on its position, similar to how the decimal system works but limited to two possible values.

The other number systems mentioned (decimal, octal, and hexadecimal) use different bases—10, 8, and 16, respectively—and incorporate additional digits beyond just 0 and 1. This differentiation allows for the representation of larger values and more complex data, but they are not based on binary principles.