What is Buddhism?

In the briefest possible manner, we can summarize Buddhism as consisting of a set of teachings that involve how we perceive ourselves and others, and the thoughts, words and actions that we engage ourselves based on those perceptions.

We can summarize these as consisting of :

Moral and ethical actions performed in thought, word and action.
Regular and daily practice of meditation.
A basic understanding of ourselves, others and mankind.

All of this acts as a holistic purification practice which results in us being more balanced and joyful in our life, and brings about greater mindfulness and skillfulness in dealing with life, its challenges and experiences.

The Dharma describes how to create the causes for happiness.