If you want to generate Hyperlinks only (no HTTP query string needed, e.g. http://myDocumentServer/myDocument/myPDF.pdf) for e.g. providing Hyperlinks to open Image files or PDF documents then create a Hyperlink element
If you want to generate a parameterized HTTP call to another web application (a dynamic HTTP query string is generated, e.g. http://www.google.com?meta=&q=Austria) for e.g. passing over parameters to the web application then create an Integration (Call from WebOffice) element.
See chapter Integration of external Applications for details.