Source: https://www.slideshare.net/kinleay/cryptography-its-history-application-and-beyond Cryptography involves itself with encryption/decryption or hashing of the messages. It’s almost a mathematical field which has a profound practical impact on our lives. Generally, other guys must not be able to read your data, even if they get hold of it and know how it was encrypted.1 Some of the most noticeable everyday life examples: Most n00b example everyone comes across: Fb lbh svanyyl qrpelcgrq guvf! :-C If you didn’t know words are shifted by 13, this would be garbage for you.