Differentiate between search engine and discovery engine.

This has led to the need to differentiate between search and discovery.

A search engine's main function is to locate documents based on the user's keywords. A discovery engine on the other hand attempts to extract relevant textual data from a corpus of text and then provides a graphical, dynamic and navigable index. The visual presentation of concepts is aimed at promoting a better understanding of the underlying content and structure of the textual data, leading hopefully to improved retrieval and hence productivity of the knowledge worker