Information retrieval approaches

The area of information retrieval (IR) has taken on increasing importance in recent years. This field is now interest to large communities several application domains (security, medicine, aeronautics, etc.). IR studies find relevant from the semi-unstructured type data. As resources generated after search can be extensive quantity and different quality, it essential rank these results according degree relevance. paper focuses text (TIR) emphasizes each approach. study presents insightful aspects TIR provides a comparative between some proposed approaches models. Each model offers advantages suffers limitations.