Uniform Resource Locator (URL) defines an address of a web page. It consists of three parts: protocol, hostname, and file name.
The protocol indicates the way the data will be processed. The most common internet protocols are HTTP and HTTPS, which display web pages. FTP is designed for working with files. Other protocols may be used as well.
Hostname gives information about the web host that provides the site. It is usually the name of an organization.
Filename refers the path to a specific file.
From Starting Your Own Affiliate ProgramGet Started