All professors have different expectations about the length and contents of annotations. Be sure to check the assignment sheet or ask your professor what s/he requires for your annotated bibliography.
An bibliography is a list of citations to books, articles, and other sources used while researching a topic. Bibliographies may be also be called "References" or "Works Cited," depending on the style manual used.
An annotation is a summary or evaluation.
An annotated bibliography is a bibliography with annotations for the items cited.
Descriptive annotations focus on describing the cited items and may include information such as:
Evaluative (or critical) annotations focus on evaluating the source and may include information such as: