The literature review is a written overview of major writings and other sources on a selected topic. Sources covered in the review may include scholarly journal articles, books, government reports, Web sites, etc. The literature review provides a description, summary and evaluation of each source. It is usually presented as a distinct section of a graduate thesis or dissertation with literature review service

Purpose of the literature review

The purpose of the literature review is to provide a critical written account of the current state of research on a selected topic:
Identifies areas of prior scholarship
Places each source in the context of its contribution to the understanding of the specific issue, area of research, or theory under review.
Describes the relationship of each source to the others that you have selected
Identifies new ways to interpret, and shed light on any gaps in, previous research
Points the way forward for further research.

Components of the literature review

The literature review should include the following:
Objective of the literature review
Overview of the subject under consideration.
Clear categorization of sources selected into those in support of your
particular position, those opposed, and those offering completely different arguments.
Discussion of both the distinctiveness of each source and its similarities with the others.