Java - Interface

Question

I was studying interface and I came up with a question in the code below:

public class TesteGerente {

 public static void main(String[] args) {

            Autenticavel referencia = new Cliente();

            Gerente g1 = new Gerente();
            g1.setNome("Marco");
            g1.setCpf("235568413");
            g1.setSalario(5000.0);

            System.out.println(g1.getNome());
            System.out.println(g1.getCpf());
            System.out.println(g1.getSalario());
            System.out.println(g1.getBonificacao());
   }
}

The part of new Cliente using as reference the interface he signs (Autenticavel referencia = new Cliente()) , what would be the real advantage of creating the object using this type of reference, and if something changes in code development ?