"A literature review is a written overview of what has been said in books, articles, reports, and other types of resources about a particular topic.
Literature reviews are more common in graduate studies (e.g., masters level or PhD studies) than in undergraduate work, but in many courses in bachelor's degree programs, you might be asked by an instructor to provide a report that serves as a literature review.
Literature reviews commonly do one or more of the following things:
Often, literature reviews are used to make a case for your particular study or research project. What commonly happens in literature reviews are the following:
(From "What is a Literature Review," Vancouver Island University Library)