The explosion of the web has made search an integral part of our daily lives. We search for almost any conceivable topic. Web search engines have made search easily approachable to almost everyone. Yet, for information professionals it is more important than ever before to know “how search works” in order to be more effective in their work. Search Engines or Information Retrieval systems often appear to searchers as “black boxes.” There is some sort of magic that happens between typing some keywords in a query box and getting back results. This approach contributes to the development of inadequate conceptual models of search. 
