What is a PCMCIA card used for

A friend keeps asking me what a PCMCIA card is and does she need it and does apple have it. I said its used mainly for laptops? Can someone clarify and is it a good thing to have? I have a G4 quicksilver and may get an Imac but just need to know what this card does. I read somewhere Apple does not have it?

PMCIA - Personal Computer Memory Card International Association
These are cards which add, if you like, an extended function to the computer they are inserted into. A common example was a modem or a netowrk connection. Not all computers have (or need) these.
Apple's most recent notebook computers, for example the MacBookPro, have a new type of card called the Express/34 card (34mm wide). Old PMCIA cards will not work in this port and the Express/34 cards do not work in older PMCIA ports.
It is a good thing to have if you need the function.
The latest iMacs do not have this port, but you would probably never need this anyway.

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