An absolute URL typically takes the following form: protocol://domain/path.
The protocol is usually http:, but can also be https:, ftp:, gopher: or file:.
The domain is the name of the website. (For example, the domain name of Indiana University’s central web server is www.indiana.edu. The domain of this website is marketing-dictionary.org)
The path includes directory and file information. You must use absolute URLs when referring to links on different servers.