In addition to being aware of all the evaluation criteria to the right, an important thing to consider for online resources is the URL. These pieces of a URL can give you hints about the authoritativeness of a website.
Host or Hostname – On this website, the host or hostname is guides.temple.edu. The host is whatever comes between the protocol and the first slash. It refers to the server the page is hosted on.
The content of the page should seem to match the host. If this page’s host was liberry.tampel.net, for example, you probably wouldn’t want to trust this information.
Check out this website for an example of a page whose content doesn’t match the host: http://www.ivyridgetrail.org/
Top-Level Domain – the TLD is you .com, .gov, .edu, etc. If you know what they’re generally used for, they can help you understand the URL and the website better. Here is a list of the most common TLDs and their intended use:
In addition to these TLDs, there are also country code TLDs that reflect the country the site was created in. Most sites created in the US don’t use their .us code, but most other countries do.
The United Kingdom uses .uk, Russia uses .ru, Germany uses .de, South Africa uses .za, China uses .cn, etc.
Wikipedia has a nice list of TLDs, including country codes.