The KDE Plasma Linux desktop environment is already a feature-rich desktop for both productivity and gaming, but the KDE development team has been hard at work adding ever more features to the DE and polishing the experience. One of the newest additions to KDE, apparently coming in Plasma 6.7 and no...
It means that multiple devices which are connected to the same TV can all control each other.
For example, say you have a streaming device (e.g. Amazon Fire Stick) and an audio receiver both hooked up to the same TV on different HDMI ports. With CEC, you could use the volume buttons on the streaming device’s remote to control the volume on the audio receiver. You could also use the power button on the TV remote to turn all three devices on/off at the same time.