intent flag over intent startActivity(i);

intent flag over intent startActivity(i);

@Override
public void onClick(View view) {
// Launching News Feed Screen
Intent i = new Intent(getApplicationContext(),
Profile.class);
startActivity(i);
}
});
what is the difference of using this code and what difference does it do
on the program compared to this doe
Intent i = new Intent(CurrentActivityName.this, NextActivityName.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(i);