Which is better encryption algorithm among DES Blowfish and MD5?

MD5 isn't a encryption algorithm, it's a hashing algorithm.

Encryption will 'hide' the meaning of the encrypted text, while MD5 will 'add up' all the text to come up with a number. This number can be compared to another time this file was 'added up', to provide a simple kind of check to see if the text has been changed or if it is the same.