Moodle is a free open-source learning management system that was created by Martin Dougiamas at Curtin University in Australia. It allows for online learning through modules that can include topics, readings, assignments, forums, and other resources. Moodle has over 37,000 sites and 25 million users worldwide who share refinements and additions to the software. Many schools and organizations use Moodle to offer online learning opportunities across different subject areas.