Scientific Study from the year 2020 in the subject Computer Science - General, , language: English, abstract: Information shared over the web keeps escalating gradually and rapidly. Due to this fast and steady growth, well-known problems are associated with retrieving desired information when needed. However, a few initiatives were introduced in the previous decade with the development of search engine technology. The search engine technology aids in the collection, storage and pre-processing a wide range of information to deliver relevant resources instantly in response to users' needs. Nevertheless, users sometimes need more effort to obtain desired information. This paper discusses the concept of information retrieval with some emphasis on the different information retrieval models. Furthermore, this paper will describe how documents are analyzed and ranked using different models.