Light
This term refers to a method named "calculateSquareRoot" that takes in a parameter of type double named "n". It calculates the square root of "n" using the Math.sqrt() function and calls another method called printSquareRoot().
The combination of method name and parameter types in parentheses. Example - calculateSquareRoot(double n)
An input variable passed into a method for it to use. In this case, "n" is the parameter passed to calculateSquareRoot().
The type of value that a method returns (if any). In this case, it's void.