A bibliography is a list of sources (journal articles, books, government documents, websites, etc.) on a specific topic. Citations in this organized list include the bibliographic information of each source, such as the author, title, and publication information.
An annotation is a summary, description or evaluation.
An annotated bibliography is similar to a bibliography, with the difference being that each citation entry includes a brief description and assessment of the cited source - an annotation. Annotations are generally short paragraphs whose purpose is to evaluate and summarize the work within the context of the research topic.