I wish to be informed  about  data in DBMS and what is the difference between them. I have tried various  resources together inputs on the same.  I am still not convinced about the information and I would like to request  you to share your ideas.

Coding the data and Error-correcting codes
Data compression
Data encryption
Data storage types

DBMS is stands for data base management system. It is the most impotent thing in web development.