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Types of CDs:

                  1.  CD-ROM (Compact Disc Read-Only Memory): A CD-ROM is

                     a pre-recorded CD containing data or software that has been
                     written  at  the time of manufacturing.  The data  stored  on a

                     CD-ROM cannot be modified or erased, making it a read-Only
                     storage medium.                                                                        CD

                  2.  CD-R (Compact Disc Recordable): A CD-R can be used to write data by the
                     user only once. This data cannot be changed or erased later.

                  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 commonly used not
                  only for storing and viewing movies  but also for storing various                         DVD

                  types of data, including software, documents, and multimedia.

                   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.




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