binary number system

1. A method of representing numbers that has 2 as its base and uses only the digits 0 and 1. Each successive digit represents a power of 2. For example, 10011 represents (1 × 2 ⁴) + (0 × 2 ³) + (0 × 2 ²) + (1 × 2 ¹) + (1 × 2 ⁰), or 16 + 0 + 0 + 2 + 1, or 19.