what's the smart card help me

[may]

ihave project in security smart card but iwant know every thing about smart cards h search about it but there many things i don't understand them
for instance how chip's smart card work?
also of types'ssmart card (optical memory card) what's it? and what it is application
what 's last version in smart card?
how many companies's smart card around the world?
plz plzzzzzzzzzzzzzz hwant to know about smart card????????????????

 

[Apokarteron]

I think its kind of like a CD

 

[may]

thank you so much