In short, to give you credibility. Just as proofreading prevents structural errors from affecting readers, literary proofreading prevents you from being inconsistent.
Part of the editor's routine is to write about varied Jewelry Retouching Service subjects, with which he does not always have much contact. In that case, looking for references is the most important process in the preparation of the article.
On the other hand, even when working on a familiar topic, it's good for the writer to do some quick research to confirm some details or delve into others.
In its most formal application, the literary review serves to review authors, books and sources, in general, that support the argument of the text. In web writing, things do not change, since it is also necessary to check that the information offered to the reader is valid and that the arguments are well founded.