What is Compile-Time Polymorphism(Method Overloading) in Java

What is compile-time polymorphism?

Compile-time polymorphism means the method is selected at compile time, not at runtime.

What is Method Overloading?

Method Overloading means having multiple methods with the same name but different parameters in the same class.
It is a type of Compile-Time Polymorphism.

Example:

public class MethodOverloading{

public void add(int i, int j){
    System.out.println(i+j);
}

public void add(int i, String j){
    System.out.println(i+j);
}

public void add(int i, int j, String b){
    System.out.println(i+j+b);
} 

public void add(int i, String j, int k, String l){
    System.out.println(i+k+j+l);
}
public void add(String l){
    System.out.println(l);
}

public static void main(String[] args){
    MethodOverloading  sp= new MethodOverloading();
    sp.add(8, 10);
    sp.add(8,"Virat");
    sp.add(8, 10, "Virat");
    sp.add(8, "Virat", 10, "Kohli");
    sp.add(8 + 10 + "Virat");
}
}

Why do we go to Method Overloading?