What is the Samsung Smart TV CI module used for?

DuoFlex CI - ci slot What does No CI Module and Scrambled mean in LG televisions? Also what does the PCMCIA cici4d slot ci slot It simply means a slot to keep smart card to view the tv Now, this CI module if it was in led tvs there is

cirque du soleil amaluna slot CI is more properly the term used to describe the slot, into which you then put a Conditional Access Module, or CAM