Khan Academy aims to provide a free, world-class education for anyone, anywhere. It uses micro lectures on multiple topics in the form of YouTube videos and includes practice exercises and tools for educators. People can participate in Khan Academy as students or coaches (teachers). The major components of Khan Academy include:
a personalized learning engine to help people track what they have learned and recommend what they can do next;
a video library with over 6,500 videos in various topic areas; and
automated exercises with continuous assessment.