Every research report/ thesis/research article begins with an introduction to the topic of research. The main purpose of the review is to introduce the readers to the need for conducting the said research.
A literature review should begin with a thorough literature search using the main keywords in relevant online databases such as Google Scholar, Pub Med, etc.
There is no set way to do this as it will depend on your preference for reading printed articles or online resources.
If you are old school and read printed articles better, then you should create a folder with all articles organized in this way: For the more tech-savy users, organization of literature either by year of publication or themes would be more ideal.
They usually focus on a single question and have clear study objectives that are worked upon in a systematic manner.
These studies are based on a well-defined strategy unlike narrative reviews.
Literature review is one of the pillars on which your research idea stands since it provides context, relevance, and background to the research problem you are exploring.
Literature reviews can be categorized as experimental and theoretical.
Writing a literature review requires you to read through and collate several research articles and literature sources.
This can get very confusing considering the large amount of publications that need to be organized.