Your Nintendo Switch console can be played in multiple ways, including handheld, but also by connecting it to the TV or an external monitor the same way that most consoles such as an Xbox or Playstation would be.
In order to do this, you need a Nintendo Switch docking station or some form of adapter as there's no HDMI port on your Switch console, only a USB Type-C port for charging. What the docking station will do is convert the signals from your console through the USB-C port to an HDMI out port, so that you can enjoy gaming on a bigger screen.
A docking station is also great for charging your switch console when not in use, and can keep it safe and secure on a shelf or mantlepiece away from pets or young children. It's a good idea to store your Switch in a reliable case or carry bag too when you're not using it to avoid inevitable dust getting in.