What is the difference between getextras().getstring("test") and getstringextra("test")?

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Android

I don't see any big difference between them but the first one asks the help of Bundle while the other one directly gets the string from the intent. It seems to me that this is a standard procedure as it is always what I see from the other code.

MainActivity:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);

    TextView usersNameMessage = (TextView) findViewById(R.id.users_name_message);

    String nameSentBack = data.getStringExtra("UsersName");

    usersNameMessage.append(" " + nameSentBack);
}

SecondActivity:

protected void onCreate(Bundle savedInstanceState)
{
	super.onCreate(savedInstaceState);
	
	setContentView(R.layout.second_layout);
	
	// gets the intent that called the SecondScreen activity.
	Intent activityThatCalled = getIntent();
	// gets the data passed by the previous activity by providing the name.
	String previousActivity = activityThatCalled.getExtras().getString("nameOfThedataToBePassed");

}

What I have tried:

I tried searching about it but haven't found an answer specific to this usage.