A directory is a website containing lots of categories such as travel, shopping,health,books etc.Each category contain website related to itself.For example travel websites will be placed in travel directory,health category will be placed in health category,shopping sites in shopping category like that.
What is the difference between search engines and directories?
When you type something on google or any other search engine,it returns result of a single web page of a website,while directory list website according to its theme under a suitable category (for example travel sites in travel category).
Another difference is search engine has programs robots and spiders which crawl the website pages and store it in their database,while each directory has its own selection criteria and if any website fills it criteria they list the website.
To increase the traffic directories also provide search facility not as strong as google to enhance the number of visitors visiting them,
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