Moodle is a free and open-source learning management system (LMS) that was created in 1999 by Martin Dougiamas. It is used in over 208 countries and 75 languages worldwide by educators, organizations, and governments. Some key features of Moodle include creating and managing online courses, facilitating communication tools, integrating assessments like quizzes, and allowing users to upload course materials for students. Moodle provides a flexible platform for delivering online or blended learning with no programming experience required.