To encrypt a file or other information stored in a computer means to convert it into a secret code so that it can't be used or understood until it is decoded or decrypted. You might want to encrypt a file if it contained a secret formula for a new invention, or some financial plans that your competitors would love to know about in advance. When you encrypt something, the computer will ask you to set up a password. After that, no one will be able to make sense of the information unless they have the same password.
Encryption hides your data from curious eyes. This is a process of encoding data to prevent unauthorized person from viewing or modifying it. The main features of data encryption are: