Source : Free On-Line Dictionary of Computing

source package
     
         A collection (usually an {archive} file) containing
        all the files necessary to build and modify a piece of
        software.
     
        A {Debian} source package includes the original source archive
        (.orig.tar.gz), Debianisation diffs
        (-.diff.gz) and a Debian source control file
        (-.dsc).
     
        (2000-05-31)