Base Four, also known as quaternary, is a numeral system that uses four digits: 0, 1, 2, and 3. In this system, each digit's position represents a power of four, similar to how base ten uses powers of ten. For example, the number 132 in base four represents 1×4² + 3×4¹ + 2×4⁰, which equals 22 in base ten. Base Four is often used in computer science and mathematics for specific applications, such as coding theory and combinatorial designs. It can also be useful in certain types of digital systems, where data can be represented more compactly than in binary or decimal systems.