Please god dont let this be the best answer....
memory card is an electro chemical divise.which store data in chemical form for the opration readingh data and writting data it rquired a charge .
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Memory card readers are devices which "read" memory cards, and are used in conjuction with home personal computers. Typically, reader is plugged into the USB port of a computer. A memory card is inserted into the memory reader's slot. The computer will then give a prompt to open and view the files on the memory card, in much the same was a USB flash drive. An individual should never remove the memory card without first safely ejecting using the computers commands.
They store information about your game like how far you are what you did last and if you pull the memory card out wile its saving or loading it will corrupt the saved game
Memory Cards store data that many different computers can read. Sometimes, a program needs to be installed for the memory card to operate, or read the information on the card.
Flash SD memory cards work by writing the memory to the flash. They are usually better than USB or earlier storage devices as they can store a larger amount of data for a lower cost.