A literature review is a very practical part of the research process. It's how you build on other research in the field - identify best practices and tools and learn what doesn't work. The resources on the page are here to help you structure you literature review so it's as useful as possible.
Also take a look at any literature reviews you find as you search for articles - in addition to content and further references they'll also provide helpful structural hints.
"Literature reviews are systematic syntheses of previous work around a particular topic. Nearly all scholars have written literature reviews at some point; such reviews are common requirements for class projects or as part of theses, are often the first section of empirical papers, and are sometimes written to summarize a field of study. Given the increasing amount of literature in many fields, reviews are critical in synthesizing scientific knowledge."