What is moodle? How much this is helping to education system?

Moodle is a learning platform (Learning Management System LMS) designed to provide educators, administrators and learners with a single robust, secure and integrated system to create personalised learning environments. 

you can upload your courses and using moodle activities (such as quiz, assignment, workshop, ...etc) to interact the students with teachers 

Moodle is open source LMS (Learning management system). It helps to put  classroom activities online. Thus students can access it remotely, securely by their own flexible time.