This video demonstrates how to construct an Expression Tree from Postfix notation. To find video on Expression Trees visit the link: https://www.youtube.com/watch?v=hFbhDWbaFz8 To find video on building Expression Trees from prefix notation visit the link: https://www.youtube.com/watch?v=XLORXuZyaaI To find video on constructing Expression Trees from infix notation visit the link: https://www.youtube.com/watch?v=n5WAgkq-v3Q