What is Buddhism?

The theme of this talk by Jetsün Khandro Rinpoche is 'What is Buddhism?' 

These days Buddhism is not an unknown subject, It is quite well known, and there are lots of materials available and many different ways to approach the topic.  But the real essence or sole purpose of Buddhism —is to work with one’s own self.  So as a spiritual practice, as a philosophy, as a way of life, as a doctrine, it doesn’t matter—as long as your relationship and understanding of Buddhist meditation and Buddhist teachings helps you develop your potential for inner awareness and inner sanity.