Major consolidations have happened in the search engine industry
. Friend has become competitors. Competitors have shaken hands Delhi consultant of yore repositioned themselves as portals. The whole industry as it stands now has narrowed down to a few players who provide the basic search function. Rest of the people has started to package those results in their own format.
To give an analogy this is also how the news industry operates. Most of the newsletters & chronicles are fed breaking news stories by wire services. These are then presented by the specific news papers in their formats. This of course is supplemented by reputed dailies by their own correspondents in the field. consultant's counterpart is having the own or borrowed directory results mixed as a part of their final results.
The search results sharing goes hand in hand with the advertising revenue sharing. Hence it serves as a mutually beneficial scenario for all. The basic feeders find more audience hence can command greater ad revenue. Services Delhi with e-fuzion the receptors can get ad revenue without actually incurring the costs of running a search service. Overture has been the most outstanding player in the paid listing category. It has the largest network for distributing its paid inclusion results to other companies.
Here in lays a brief list of feeders & receptors. This list covers the major players in a summary. For more detailed charts & listings you can check this excellent visual