A binary system is a way of representing information using only two symbols, typically 0 and 1. This system is the foundation of all modern computing, as computers use binary to process and store data. Each 0 or 1 is called a bit, and groups of bits can represent more complex information, such as numbers, letters, and images. In a binary system, every number can be expressed as a combination of these two digits. For example, the decimal number 5 is represented in binary as 101. This simplicity allows computers to perform calculations and operations efficiently, making binary an essential part of technology today.