Insights of indexing

Understanding Search engines  - Insights of indexing

Several times I have been asked questions like how search engines work. How does it manage to show so relevant search results of our query. How it indexes newly launched web portals. Loads of question regarding search engine.  In this series of  "Understanding Search engines  - Insights of indexing",  I'll try to answer all the question regarding same. In the present article, I have tried to explain the very basic idea of search  engine and their type.