How to go back to an already launched activity in android

I want to go back to an already launched activity without recreating again.

  @Override
    public void onBackPressed() {
     Intent i = new Intent(SecondActivity.this, FirstActivity.class);
     this.startActivity(i);

    }

Instead of doing is there any other way to go back to another activity which is already created, which I get back with " Back button "

via Chebli Mohamed