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3.  CD-RW (Compact  Disc Rewritable): A CD-RW  can be used to write data

                     again and again. The data stored can be erased and modified as many times as
                     required.

                  Digital Versatile or Video Disc (DVD)
                  DVDs  are widely used and have become a popular  medium  for

                  storing information and video. A DVD is almost similar to a CD. Even
                  the working is also similar. The only difference is that it can hold
                  more information than a CD. DVDs are used not only for storing
                  and viewing movies but also for any type of data. DVDs are used not
                                                                                                             DVD
                  only for storing movies but also for storing any data.
                   Clickipedia




                    The pen drive was invented in 1998 by IBM.




                  Blu-ray Disc
                  A Blu-ray disc is an optical disc. It is used for storing large amounts

                  of data, and playing videos. The main difference between DVDs and
                  Blu-ray discs is storage capacity. Blu-ray discs can hold up to 25 GB
                  of data on a single layer. This is significantly more than DVDs, which
                  typically hold up to 4.7 GB on a single layer.                                         Blu-ray Disc

                  Flash Memory

                  Flash memory is a type of storage that keeps information safe even when the power
                  is turned off. It is a type of non-volatile storage medium that can be electrically
                  erased and reprogrammed.


                  Pen Drive
                  A pen drive is a small, portable data storage device that uses flash memory and
                  is  integrated  with a USB  (Universal Serial Bus) connector.  It acts as a portable

                  storage  device and  is easy to use, as it is small  enough  to be
                  carried in a pocket or on a keychain. It can be plugged into any
                  computer or device with a USB port. Flash drives come in various

                  storage capacities, ranging from a few megabytes (MB) to several
                                                                                                         Pen drive
                  terabytes (TB), with common capacities up to 1 TB or more.









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