Most of the top ranked search engine are crawler based on search engines but some are may be based on human compiled directories. In order to accomplish you eriuqs spires healthy recreation pages you have to know the Google algorithms. Because when search query is submitted on Google sites are determined to its relevant or not relevant on the search query according to the algorithms I have been read. The most important difference to realize is search engines and directories are not the same. Search engine use spider to crawl the websites they find, and also the submitted sites. But in this eriuqs spires healthy recreation Directories is not more important. Let us now look for more detailed explanation on how Search Engine work.