What is Buddhism?

Buddhism is a recipe for happiness.
It says that there is a problem in life - duhkha - which can be translated as mental suffering, undue stress, or lack of balance, and this problem robs us of happiness. It says that this problem is not in the world itself, but in our flawed approach of it. It says that you can overcome the problem, and live a life of balance, without duhkha. It offers a route to this happy state, by changing behaviour and practicing meditation.