An annotated bibliography includes the citation for sources used to research a topic as well as a summary and/or evaluation of each of the sources. The citation style depends upon your discipline. Annotated bibliographies help you learn about your topic AND helps others learn about the topic.
Writing an annotated bibliography is excellent preparation for a research project. When you have to write annotations for each source, you're forced to read each source more carefully.
Parts of an Annotation
Not all annotated bibliographies will include all of these elements! Look at your assignment, ask your instructor, or inquire about procedures in your discipline to determine what is often used.