FrontPage lets you verify that your pages look and function the way you want, in Preview view, or by previewing in one or more Web browsers.
Publishing on an extended server (one that supports the FrontPage Server Extensions, or SharePoint Team Services) lets you add form handlers and other Web components , and take advantage of collaborative tools.
Publishing to an FTP site gives you flexibility: you can publish to the same site from different locations, using different Web page creation software.
Publishing to a location on your local network, or on your own filesystem, gives you a backup version of the site, in case you need it.
FrontPage streamlines the process of synchronizing either selected Web page files, or all files, on both the remote and local versions of a site.