Khan academy - is an application of non-commercial educational instituition which teaches everything to everyone. With the help of this application you can look through lecture categories, search for something you are interested in and then watch thousands videos absolutely for free.

Funkcijos:

• Various themes of lectures
  
• Over 10 thousand video lessons
  
• Huge database of interactive questions
  
• Fast and handy search
  
• Synchronization with the site