It is a document containing an alphabetical list of citations and "annotations" (summaries) for sources on a particular subject. The citation is the bibliographic material related to the source (author, date, title, publication city, publisher, journal title, online address, newspaper title, etc.). Each of the sources you cite in your annotated bibliography will be cited in APA style.
The annotation is your summary of this source, including a brief description of how (specifically) this source was, will be, or could have been used in your projects 2 &/or 3. Your annotated bibliography will contain no less than 3 sources (at least one of those sources will be from a peer-reviewed, academic journal). Note: your group may have decided later not to use one or two of these sources, but you can still include them in your annotated bibliography provided they speak to your topic in some direct way.
Each annotation should be no less than 250 words long. Each explanation of how this source informs or works in your project should be no less than 100 words.
For more information on how to write an annotated bibliography & an example of one, go here.