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Pen drive is a storage device. Its a small pen like device which is connected to the USB port of our computer. It can store data like a floppy, again and again but is highly reliable. 

Using a pen drive is simple: the user inserts one end of the drive, which is equipped with a USB connector, into the USB port on a desktop or laptop and activates it. Once the drive is active, files can be dragged and dropped or copied and pasted into the memory. The process is usually no more difficult than attaching files to an email or copying files onto a disk, mp3 player, or other storage device.