These are more likely to return sites from credible sources. They save time by automatically filtering out poor quality material so you don't have to.
Use Internet Sources when:
You are prepared to evaluate the credibility of what you find
Much of the internet is opinion, undocumented, or otherwise not suitable for academic research. While good information can be found on the internet, it is mixed in with poorer quality material. Be prepared to spend time weeding the bad from the good.
You need Popular Culture or very current information
You know the website you are searching is credible
See Evaluating Web Sites above, or use one of the recommended Search Engines on the page.
Evaluating Web Sites: The Good, the Bad, the Ugly, and How to Tell the Difference
Authority
Reasons for consideration:
Questionable site:
https://www.naturalnews.com/027178_autism_vaccines.html
The author is an editor but does not appear to have any medical credentials. The "sources" either don't work or are invitations to buy books from Amazon or from this company. The site sells natural supplements and hence has an interest in information that support its products.
Good site:
https://www.cdc.gov/vaccinesafety/concerns/autism.html
This information comes directly from the Centers for Disease Control and Prevention, a government research organization. Cites are to reputable sources in medical journals.
Objectivity
Reasons for consideration:
Questionable site:
http://www.cornyn.senate.gov
The information is probably true but is likely to be biased since it comes from the subject's own personal page.
Good site:
http://votesmart.org/candidate/15375/john-cornyn#.UmbHxiTkDYd
Information is provided by a non-partisan organization.
Content
Reasons for consideration:
Questionable site:
http://www.ihr.org/
The information seems legitimate until you realize it comes from the same point of view. Organization has a distinct bias masquerading as informed educational content. Circular cites only reinforce each other
Good site:
https://encyclopedia.ushmm.org/content/en/article/childrens-diaries-during-the-holocaust
Although it has a purposeful message, it cites primary documents and videos to make its point. The sources include academic sources, and the About page points to verified scholarly activities in which the museum participates.
Ease of Use
Reasons for consideration:
Questionable site:
https://www.naturalpedia.com/
Page is a huge list of links, and is very hard to read and navigate
Good site:
https://www.britannica.com/
Information is organized into self-explanatory categories; page offers a site organization map, a browse feather, and a search function for further assistance.