It is a widespread misconception that, if a user types a query into each search engine seocontest2008 which has questioned on Web pages that match the query. That is not how it works for everybody. Instead, the search engine looks at its own copy of the website. Each search engine actually creates its own version of the Internet. This version is called an “index”.

The size of the index of a search engine varies from one search engine to search engine, but it is still much smaller than the website as a whole. For example, as the 28th February 2004, it is at the moment that the entire site is currently composed of approximately 15 to 20 billion web pages, while Google, the search engine the largest index is around 6 billion pages in its index.