What is the difference between directories, search engines, and meta-search engines?

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What is the difference between directories, search engines, and meta-search engines?

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Directories are web pages grouped by topics or categories. Search engines are computer software that searches and identifies web pages related to the search term you select. A meta-search engine is software that submits your search term to several different databases at the same time to try to develop a more complete search of relevant web pages 3.9. What are the advantages and disadvantages of using the public internet in conducting a literature search? The disadvantages are the time required for a search and the potential lack of credibility or accuracy of the information received. The advantages are the wealth of information provided and its accessibility 24 hrs a day 3.10. How would you evaluate the validity of information obtained over the Internet? By looking at the source of the information, the purpose of the web page, whether the information is traceable to factual information, whether there is some acknowledgement of the limitations of the information, the last date the web p