What is the purpose of Card Reader?

[ajayritik]

Normally we have Memory cards that we use predominantly in Digital cameras and Cell phones. So when we connect these devices to PC, they will be recognized. Why then do we require a separate Card Reader when the Cards are being recognized when they are inserted in the required devices.

[ThinkFree]

They are there so that you can retrieve/write data on a card without having any device and you can use them as portable media as well to be used on different computers like floppies/cds