6) What is Fragmentation?

      The scattering of the parts of the same disk file over different location is called fragmentation.

7) What is Defragmentation?

   The process of rewriting parts of a file to contiguous sectors on a hard disk to increase the speed of access and retrieval is called defragementation.

8) What is scan disk?

     Scan disk is a process ,which invovles in maintaining the disk files and folders using a kind of utility software.

9) What is back up?

   A copy of a file which is used in the event of original file being corrupted is called back up.

10) What is password?

       A password is a secret word or phrase that gives a user access to a particular program or system.