A parameter allows you to pass in a value to a method as you call it.
public static void name(type name) { // declare
methodName(expression); // call
Example:
public static void squared(int num) { System.out.println(num + " times " + num + " is " + (num * num)); } ... squared(3); // 3 times 3 is 9 squared(8); // 8 times 8 is 64