Domain forwarding is also called as URL redirection/forwarding. It is a technique on the world wide web for making a web page available under many URLs. It allows to redirect web requests of our domain name to content hosted on a different server.
The users might search the same URLs with different names/spellings, by mistake - for example gogle.com and googel.com can be searched by users while searching for google.com. In this case, the companies or organization can register these domains as well so that it can be redirected to the correct one - google.com.
An author may move a site to a new domain name. Using the URL redirects, the incoming requests to the old URL can be redirected to the new URL. This will help the users who use bookmarks and will also avoid searching and detecting the new URL in search engines.