what is a common interface slot ?

what is a common interface slot ? common interface slot CAMs Conditional Access Modules used in satellite receivers with CI Common Interface slots in order to read subscription cards common interface slot In this case the Common Interface in the Samsung TV What it does for the end user? In essence, the concept of Common Interface allows for

common slot machine symbols possible watch Pay TV , simply by inserting the correct CAM and subscription smartcard into the CI slot This is Linux Window TV tuner Box