IMPORTANT: Check the guidelines in your assignment first. Always follow your professor's instructions!
Essential Content* - In general, an annotation should do three things:
Additional Content* - Some assignments require additional elements:
*Always check the instructions from your professor! The instructions from your professor override any guidance offered here.
The "Essential Content" section above is adapted from "Annotated Bibliographies." The Purdue OWL, Purdue U Writing Lab. Accessed 19 Sep. 2019. https://owl.purdue.edu/owl/general_writing/common_writing_assignments/annotated_bibliographies/index.html
The short answer: it depends!
One or two paragraphs (think 250-500 words) would be typical. But length will vary based on:
Use these websites to help you with grammar, punctuation, and sentence structure. Some of these will automatically check your writing and suggest edits for you!