A literature review is NOT an academic research paper, an annotated bibliography, or a report on original research.
Unlike an academic research paper, the main focus of a literature review is not to develop a new argument. A literature review is an overview of a topic that shows the reader what research has been done on that subject. A literature review may build on an annotated bibliography, but it does more than just summarize each article; a literature review should compare and contrast the ideas each article contains, highlight interesting trends and inconsistencies within the research, and suggest future research that is needed on the topic.
Not every literature review is the same; some literature reviews include very detailed methodologies, or sections defining terms or concepts relevant to the topic, or in-depth background history, or a paragraph discussing the challenges involved with reviewing the literature.
But most literature reviews will incorporate these key components: