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A bibliography is a list of sources (books, journals, websites, periodicals, etc.) that have been used for researching a topic. A bibliography usually just includes the bibliographic information (author, title, publisher, etc.).
An annotated bibliography is a list of sources that gives the publication information and a short description — or annotation — for each source.
An annotated bibliography shows that the author has understood the sources used during their research on a topic and gives the reader enough information to decide whether they should read the specific work.
OWL - Purdue Online Writing Lab provides examples of Annotated Bibliographies for APA, MLA, and Chicago Styles.