The Square Root of 2 is a mathematical constant that represents the number which, when multiplied by itself, equals 2. It is approximately equal to 1.41421356. This value is significant in various fields, including geometry, where it appears in the calculation of the diagonal of a square with sides of length 1. The Square Root of 2 is classified as an irrational number, meaning it cannot be expressed as a simple fraction. Its decimal representation goes on forever without repeating. This property makes it an important example in the study of numbers and their classifications in mathematics.