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SEO (Search Engine Optimization) is defined as any action or adjustment, also known as Optimization that you perform on your site for the purpose of improving the volume and quality of traffic to your site from search engines by utilizing search results for targeted keywords. Relevance - the degree to which the content of the documents returned in a search matched the user's query intention and terms. Popularity - the relative importance, measured via citation (the act of one work referencing another documents) of a given document that matches the user's query. SEO can be considered to be divided into two categories: On-Page Optimization:  Changes or additions that we make on the website to target a keyword and improve website rankings for that keyword. Off-Page Optimization:  Efforts done not on the website itself but on other websites and online communities to make a website look popular in the eyes of search engines. For e.g., building links to the website.

A software programs , or a website whose primary function is gathering and reporting information available on the Internet, or a portion of the Internet. Search engines are essentially massive databases that cover wide swaths of the Internet. Search engines are online services that allow users to scan the contents of the Internet to find Web sites or specific information of interest to them. Major internet search engines are – Google, Bing, Yahoo, Ask.com, AOL etc.  The main functions of software involve gathering data, evaluating or sorting it, and presenting the relevant data to the users for a given query. Accordingly, search engines have following main components Crawling:  Search Engines have special softwares known as spider, crawler, or bot, which "crawls" through the Internet gathering information. The spiders crawl over the web page, cataloging the words and links (and following these links to other websites), and then creating an index or listing of "key sea...