What is Literature Review

It is about reviewing the critical points of current knowledge including substantive findings as well as theoretical and methodological contribution towards a particular subject. Nevertheless, they are secondary sources that do not report any new or original experimental work but as a thesis for preceding a research and results section.

A literature review must be

• organized around and related directly to the thesis 
• synthesize results into a summary of what is and is not known
• identify areas of controversy in the literature
• formulate questions that need further research

A literature review is a piece of discursive prose, not a list describing or summarizing one piece of literature after another. You are not trying to list all the material published, but to synthesize and evaluate it according to the guiding concept of your thesis or research question.