Below these details is a hierarchical display of broader and narrower terms. Alternatively, if you see a broader or narrower term that is more appropriate to your search, you can choose that term instead. Topical subheadings include complications, economics, education, history, nursing, psychosocial factors, prevention and control, symptoms, trends, and various types of therapy. Back to the top . Effective use of the Internet If you've done any Internet searching lately, you may have been frustrated by the results.
Most search engines are indexes created by robots.
Since these robots index each keyword every time it appears in a web page or its links, your search results may list the same site several times. In addition, many business sites will purposely load their web pages with irrelevant words because they are popular search terms, thus increasing the number of people visiting their site. There is an alternative way to search the Internet. Directories or Web Catalogs are created by humans who examine each web page and assign subject categories to them. Yahoo is an example of a Directory.