Data Views allow you to view data and enter data into a variety of data sources.
Data Views are also known by the names Data Form Web Parts (DFWPs) and Data View Web Parts (DVWPs).
Data Views follow the same rules as other Web Parts.
Data Views use XSLT to transform XML data into HTML.
LVWPs use CAML to query and format list or library data as HTML.
You can use SharePoint Designer to convert an LVWP to a Data View, which allows you to use advance manipulation and formatting methods.
You can use SharePoint Designer to import and export Web Parts. When you export Web Parts, you can save them either in the Web Part Gallery or on the file system.