Backend with CI module support? common interface

Backend with CI module support? common interface what is the common interface slot for on my tv May I show my stupid side and ask what you would actually use the CI or CI+ slot for? TV packages otherwise totally pointless these days what is the slot in football Most TV's have on the back of them a slot called a Common Interface, this So, i wont to replace my existing CI

what is the slot in football CAM is Conditional Access Module with common conditional access interface in TVs and digital television receivers

what are the best slot machines to play The Common Interface is a technology which allows decryption of pay TV channels Pay TV stations want to choose which encryption method to use  Don't know anybody who uses this? Why don't manufacturers drop this feature & give us more HDMI sockets, headphone socket etc?