Difference between DialogFragment and general Fragment

I have a project on Java with big legacy. There always used DialogFragments, even in places where it's not actually need. I use to refactor this(75 DialogFragments), but I have doubts - should I do this. From that - question: what difference? As for me, I see only one obvious thing, DialogFragments always has this code, each I could clean:

@Override public void onStart() {
    super.onStart();

    Dialog d = getDialog();
    if (d!=null){
        Window window = d.getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        MainApplication.getInstance().getScreenBrightness().observe(getViewLifecycleOwner(), (screenBrightness) -> {
            WindowManager.LayoutParams lp = window.getAttributes();
            lp.screenBrightness = screenBrightness;
            window.setAttributes(lp);
        });
    }
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(STYLE_NO_TITLE, android.R.style.Theme_DeviceDefault_Light_NoActionBar_Fullscreen);
}

But maybe exist any more important differencies?