Moodle is a free and open-source learning management system that can be used to create online courses and websites. It allows users to build courses with various tools like assignments, quizzes, surveys and more. Moodle has over 400,000 registered users in more than 200 countries and supports over 70 languages. Major universities, schools and companies use Moodle to provide e-learning opportunities to their students and employees. The document then provides details on how to set up Moodle and customize it to build an e-learning website.