You will need an app from whatever TV channel you want to watch. I have several European channels on the iPad. Once you have that, depending on your iPad and TV models (if your TV has HDMI ports), you will need a lightning to HDMI adapter. Or it could be older and have different ports, so then you get an adapter for that.
In any case, once you have the app on the iPad and the adapter to plug it into the TV, set your TV to the port where your iPad is plugged in and you can choose what you want to watch from the iPad: your iPad screen will be displayed on the TV screen.