A literature review ought to be a clear, concise synthesis of relevant information. A literature review should introduce the study it precedes and show how that study fits into topically related studies that already exist. Structurally, a literature review ought to be something like a funnel: start by addressing the topic broadly and gradually narrow as the review progresses.
from Literature Reviews by CU Writing Center
Reference to prior literature is a defining feature of academic and research writing. Why review the literature?
from Literature Review Basics from University of La Verne
Before writing your own literature review, take a look at these resources which share helpful tips and tricks: