An annotated bibliography is a list of sources (like books, articles, or websites), each followed by a short summary or evaluation.

Some annotations:

• Summarize the main ideas of the source.
• Evaluate the quality or usefulness of the source.
• Reflect on how the source fits into your research.

Your professor will let you know what kind of annotation is required—summary, analysis, or both.

See the link below for more details and examples.