HDMI (High-Definition Multimedia Interface) is a standard for transmitting high-quality audio and video signals between devices. To connect an HDMI cable to your TV and laptop you can follow these steps: 1. Plug one end of the HDMI cable into the HDMI port on your TV. 2. Plug the other end of the HDMI cable into the HDMI port on your laptop. 3. Turn on your TV and laptop and select the HDMI input on your TV using the remote control or the menu button. 4. Adjust the display settings on your laptop to mirror or extend your screen to your TV. 5. Enjoy watching or playing content from your laptop on your TV.