Focus on the relevance of the material to your proposed topic, and map out a logical framework for analyzing that material.
It is an important showcase of your talents of: understanding, interpretation, analysis, clarity of thought, synthesis, and development of argument.
The process of conducting and reporting your literature review can help you clarify your own thoughts about your study.
There are three stages at which a review of the literature is needed: This applies especially to people doing Ph Ds on a part-time basis, where their research might extend over six or more years.
You need to be able to demonstrate that you are aware of current issues and research, and to show how your research is relevant within a changing context.