The HDMI-CEC feature on your television allows virtually any remote control to communicate directly with devices that attack to the HDMI port on your TV. It can allow you to use a remote with streaming boxes like the Roku or Chromecast.
Enabling HDMI-CEC on your TV can be confusing because manufacturers call the feature different names. You may have to check the documentation provided with your TV to see if it supports HDMI-CEC. If it does, these steps should turn the feature on.