A wiki knowledge base is a collaborative online platform that allows users to create, edit, and share information about a specific topic or domain1. A wiki knowledge base is best to use for storing lessons learned because it enables easy access, retrieval, and update of the lessons learned by project teams and stakeholders2. A wiki knowledge base can also support keyword search, version control, and linking of related documents3. A wiki knowledge base is different from a whiteboard, which is a physical or digital board that can be used for brainstorming, sketching, or presenting ideas; a content management system, which is a software application that allows users to create, manage, and publish digital content; and a workflow platform, which is a software tool that automates and streamlines business processes4. References = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 14: Closing the Project, page 403; Capturing Lessons Learned in Project Management [2023] • Asana, Different types of lessons learned sessions and Lessons Learned Process in Project Management sections; Project Management Lessons Learned | Smartsheet, What Are Lessons Learned in Project Management? and Lessons Learned Process in Project Management sections; How to Do Lessons Learned in Project Management, Store and Retrieve sections.