Dharma is an ancient word for truth.
There is a dharma for yourself, for someone else, for a family, for a nation, for a universe. There are collective and individual dharmas.
When you are following dharma, you will be happy, at peace, still inside. There will be a sense of purpose to your life. Difficulties will not seem unconquerable.
You are dharma. You are a wheel. And the wheel of dharma spins.