The card reader - decoding is a key component of the set-top box that allows you to decode and play back various encoded TV signals. There are several different decoding standards, including CI/CI+, Irdeto, Conax and UNI card readers that allow access to various encrypted TV channels and services. This feature is particularly useful for those wishing to watch pay or encrypted channels, as it allows access to channels by entering the correct decoding key or card. This gives you the opportunity to expand your TV options and watch a wide range of programs and content of your choice.