What is the square root of 25?

The square root of 25 is 5 because the square root of a number is defined as a value that, when multiplied by itself, yields the original number. In this case, 5 multiplied by 5 results in 25 (5 x 5 = 25). Therefore, 5 is the principal square root of 25, making it the correct answer. Understanding square roots is fundamental in mathematics, as it aids in solving equations and understanding various mathematical concepts.