7-Zip is an open source file archiver designed for Microsoft Windows. 7-Zip uses the 7z archive format, and can read and write to other popular archive formats. The program can be used from a command line interface, graphical user interface, or Windows shell integration.
7-Zip may be used to create encrypted files or folder copies for moving information to a different device - for example copying and moving to an external flash drive, hard drive, or phone. It does not, however, replace the use of BitLocker for storing data on a fixed drive.