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3.3                                            DATA COMPRESSION










                 Let us understand the meaning of compression.

                 Suppose, you want to send a message "AAAAABBBBCCCDDDDD".

                 You can compress it into "5A4B3C5D", which has the same meaning but takes up

                 less space. This is an example of compression.






                         Compression is the  process of  representing  data or
                         information  in  a  reduced  form. We  compress data  to

                         reduce the size of a file.




                 Abbreviations  are  the  simplest  example  of compression. Look at  these
                 abbreviations.


                                               Jan                              January


                                               Feb                             February


                                               Oct                              October


                                               Nov                            November


                                               Dec                             December


                                               Sun                              Sunday


                                               Sat                             Saturday


                                               LOL                       Laughing Out Loud


                                               UP                           Uttar Pradesh


                 These abbreviations on the first column are the compressed form of the information
                 on the right. We can compress the data in any way.


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