The sqrt() function calculates and returns the square root of a given number (a).
Math.sqrt(a): This is the actual method call for using the sqrt() function in Java.
Square root symbol (√): The square root symbol represents finding the value that, when multiplied by itself, gives us our original number.
Cube root: Similar to square roots, cube roots involve finding the value that, when multiplied by itself twice, gives us our original number.