CD/DVD:
a CD is a disc that can hold music on it and you put it into a CD player and the speakers will play out whatever song it is.
A DVD is a disc that can hold movies and videos and you can put them into a DVD player and it will show put onto your TV.
Flash drive/USB
a USB is a device that you can use to store different types of files and these files are likely to be small because USB's can only hold so much and the memory is small.
External hard drive:
an external hard drive is used to move large files from one computer or another. it has alot of memory and you use it when you are transfering large files.
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