This tutorial from NCSU gives a good overview of the process of the literature review.
A Literature Review is an integrated summary of existing research on a particular topic. In it, you identify sources, summarize their points, and then critically evaluate them as they relate to each other. You also need to establish that the existing research has not yet covered the aspect of the topic that you are or will be researching. Aspects of the topic that need further research or which are controversial should be identified, as well.
Detailed literature reviews typically include the following: