Search Engines:
Search engine spiders or crawls through the internet in search of necessary information. It uses sophisticated program for crawling through various pages that it meets up. After proper analysis of the every single word in all of the pages, they are stored. With the help of an algorithm search engine determines the relevance of the topic when a searcher searches for information. The search engine searches in its databases, and then gives a list of documents, which have relevant words used by the searcher. Search engines list the Web Pages only.
Web Directories:
Human editors than robots, unlike the search engines, carry out compilation of directories. Web directory is more of like phone book, which is there in the web in a complex form. Most of the web directories are human edited, and the addition of links of website to it is dependent on the review of the editors. They do the categorization of the links as well. For organization of the database, directories have a tree structure rooted to some hierarchy. Web directories list the links of the whole website. There are main categories as well as sub categories in web directories.
The changes made on the websites will not affect their rankings in web directory, except when there is drastic change. Web directories are useful while looking for available content based on the required topic, and due to good organizational structure directories can save time for research. Web directories can help in increasing the website traffic much better than search engines if you go for paid submissions, or bidding based submissions.
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