Encryption is a security method where the data is converted into a form that cannot be understood by people who do not have authorized access to it.
This data is said to be ciphered and to read the data the code must be deciphered or decrypted. Encryption is usually done through a key that uses an algorithm to convert the data into digital form. To use this data again the original key should be used to decrypt the data. Encryption is essential on the network to protect the data against unwanted attacks. E-mail also can be encrypted using software like PGP, which help in encrypting the contents of the mail, which can be only opened with the key.