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This question is very short and simple answer very long and difficult. I will try to add very litter part of seo. I hope you like it.
Whenever you enter a query in a search engine and hit 'enter' you get a list of web results that contain that query term. Users normally tend to visit websites that are at the top of this list as they perceive those to be more relevant to the query. Behind this website rankings we have to use few techniques which are called seo techniques.