Looking into the three basic models of information retrieval,
we find out that the information retrieval models are basically the
different ways by which one would be enabled to find out the
right document that would fulfill one’s requirements. These ways
are either conventional ways that look up for exact matches or
the unconventional ways that have the approach of partial
matching [1][2]. An instance of the conventional ways is the
Boolean approach in which the exact match of the query is found
and the document giving this match thereby satisfying the query
is retrieved [1][2].