How does Hisense TV project a screen on a mobile phone?

I learned that things can be like this:

1, click on the quick projection screen.

2. Click the scan code on the home page to cast the screen.

3. The mobile phone inputs the screen projection code on the TV to connect.

4. The QR code of the scanned TV can also be connected.

5. The screen projection of Hisense TV is completed.