The platform known for online course creation and sharing is Udemy. This platform allows instructors to create and publish courses on a wide range of topics, making it accessible for anyone to learn new skills or knowledge. In addition to Udemy, platforms like Coursera and edX also offer online courses in partnership with universities and organizations. These platforms typically provide a combination of video lectures, quizzes, and community forums, enhancing the learning experience and enabling users to acquire knowledge flexibly.