The world of search engines has changed during the recent years. Many search engines have chosen to use 3rd party search results to power their own search engines.
We have gathered all of the search engines that maintain their own unique indexing (Core Search Engines), while providing their databases to many more search engines, ones that do not index websites by themselves. This means that when your website is being submitted to the Core Search Engines, it will also get listed in all of the search engines that are powered by the Core Search Engines (3rd Party-Powered).
In addition to those 2 kinds of search engines, there are also 2nd-Tier Search Engines (engines that are smaller but still expand your website's global awareness), and Regional Search Engines that provide indexing for certain regions.