An annotation briefly describes the content (or discussion) of a specific article, book or source. Annotations are similar to metadata in blogs, or good essay titles. They effectively inform the reader, allowing them to decide whether the following material will be useful in their studies.
A bibliography is a list of sources (books, articles, etc.), just like the ones you’ll find in any essay or scholarly article. However, an annotated bibliography is different. It is distinguished by the fact that annotation from the author follows each source. This format allows the reader to conclude whether the source is relevant and accurate.
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