Which numeral system uses base-2 and consists of only 0s and 1s?

The numeral system that uses base-2 and consists exclusively of 0s and 1s is the binary system. In this system, each digit represents a power of 2, which makes it ideal for digital electronics and computing because it aligns with the two-state nature of electronic circuits (on and off).

Unlike the decimal system, which is base-10 and includes digits from 0 to 9, or the hexadecimal system, which is base-16 and includes digits from 0 to 9 and letters A to F, the binary system is limited to just two symbols. The octal system, being base-8, uses digits from 0 to 7, further distinguishing it from binary. The simplicity and efficiency of binary make it the foundation for most modern computing systems.