good wiki

Binary number

A binary number is a number expressed in the base-2 numeral system or binary numeral system, which uses only two symbols: typically "0" (zero) and "1" (one). The binary number system is widely used in computer science and electronics because of its simplicity and compatibility with digital circuitry.

More at Wikipedia

About

The binary number system is widely used in computer science and electronics because of its simplicity and compatibility with digital circuitry. In this system, each digit is referred to as a "bit" (short for binary digit), which can be either 0 or 1. The position of each bit in a binary number carries a weight, and the value of the number is determined by the combination of the bits and their weights. Binary numbers are also fundamental in data storage and transmission, as most computer systems represent and manipulate data using binary digits. This Wikipedia page on binary numbers provides a comprehensive overview of this number system, including its history, representations, arithmetic operations, applications, and related topics.