This document provides an introduction and overview of Moodle, an open-source learning management system. It defines Moodle and discusses its widespread adoption, with over 46,000 registered sites and over 32 million users globally. It outlines the key features Moodle offers for assessment, communication, content uploading, and more. Finally, it discusses how Moodle supports best practices in blended learning, is student-centered, interactive, collaborative, and allows for personalized and on-demand learning.