What is the function of encrypt?

What is the function of encrytp,channel encode and multiplex briefly with solid examples.

Function of Encryption is to convert the data into a form which cannot be interpreted by any unauthorized user. This process is used for the security of data.
Function of encoding is to putting data into a specialized format for efficient transmission or storage.
Function of Multiplexing is to combining multiple signals for transmission over a single shared line or a media. For example, several telephone calls may be carried using one wire.