What is Piazza?
Piazza is a free platform for instructors to efficiently manage class Q&A. Students can post questions and collaborate to edit responses to these questions. Instructors can also answer questions, endorse student answers, and edit or delete any posted content. Piazza is designed to simulate real class discussion. It aims to get high quality answers to difficulty questions, fast!
Add the Piazza tool to your course.
Follow the instructions for How do I choose which tools to be available in my course? to add the Piazza tool to your course.