Moodle is an open source learning management system (LMS) written in PHP.
Moodle is learning platform designed to provide educators, administrators and learners with a single robust, secure and integrated system to create personalized learning environments. Its capabilities include multilingual platform, plugins support and themes.
The word moodle was acronym for modular object-oriented dynamic learning environment.
The official documentation page for moddle can be found in this website https://docs.moodle.org/