links

image of a filing cabinet : http://www.salixgroup.com/images2/insulatedfile.jpg

definition of database: http://webopedia.com/TERM/d/database.html
definition of file : http://webopedia.com/TERM/f/file.html
definition of filenames: http://webopedia.com/TERM/f/filename.html
definition of extension: http://webopedia.com/TERM/E/extension.html
diff. of data and information: http://webopedia.com/TERM/d/data.html