When casting or doing a screen mirroring, your Android device acts a host that handles the exchange of the screen-casting data. Enabling the cast screen on your Android device would trigger it to pair with another device that is connected to the same network and is running a screencast server on its system. Once a secondary medium pairs with your device, it will initiate a cast screen connection, enabling the secondary medium to stream the data of the host device. In layman’s terms, you will now be able to use your TV as your mobile screen.