It provides links and summaries to several of the major search engines. Type URL information accurately. Use upper and lower case as specified. Protocol is the general method used to retrieve the information. In the example above http means a hypertext document on the World Wide Web.
Host refers to the specific computer at which the information is located.
In this case the information is stored on a computer at Allegheny. In this example the information is in a subdirectory called computing which is in a directory called resources. Once you find what appears to be a relevant link to your topic, you must take the time to evaluate the site. It contains links to web sites which address the issues of evaluating web sites. Each discipline has a different convention for citing resources.