hybrid engines (META engines and those using other engines' results);
H a ve integrated directory linking to them (Dmoz,Yahoo directory)
directory generally depends on a mixture of luck and content quality. Sometimes you may "apply" for a discussion of your website, but there's no guarantee that it will be done Or you may need to Seo your site
Search engines (SEs) are classified into crawlers, directories, META engines and paid-inclusion engines.
Crawler-based SEs use software called robots, spiders, or crawlers to add new pages to its database which is called an index. Directories use humans to manually fill their databases.
After your site has been included in an index of a crawler-based search engine, you will appear in its results, and your position for a certain search query depends on how relevant the spider finds your page for this query.
Your directory listings are quite influential to your positions in crawling search engines.