PASSWORD PROTECTION in LINUX in mailing
 

There is password protection feature in outlook express in MS OFFICE,now, I want to know that, is there any feature in LINUX just like THAT ?

Welcome. What is that program for? Can you please describe what you want put a password on?

If you are referring to files like productivity documents like for word processing, spreadsheets, or presentations then use LibreOffice and choose File->Save As and then click "Save with password"

If you are referring to sending e-mail, then see Thunderbird and its Enigmail plugin. It supports the OpenPGP standard for encryption.

If you are referring to some other activity please clarify what it is you want encrypted.

Yes.