What is an seo that is search Engine Optimization ?

Before knowing the seo it becomes mandatory to know what the Search Engine. So, the search engine is an online application which is used to process our search request according to our request parameters. This application works based on the algorithm specially designed for such type of applications. What's a search engine really works? Search engine examines it's own database for searching requested query first. Apart from this there are many other simultaneous task being done by search engine, and based on the result of these different simultaneous task it creates the view which is shown to the user.
Now, the search engine optimization is a process which is done to make a web page search engine friendly. So, that it faces no difficulty in reading these web pages from the web and show them in the top searches of the result. The SERP position depends upon the various factors, so if we want our pages in the top of these SERP than we have to work according to some rules and emphasis on some of the major points which are recommended by the major search engine like Google, Yahoo, Msn. So in order to make our page search friendly we have to follow some guidelines recommended by the experts.