What is the difference between mindfulness and meditation?

They are related but not the same. Meditation is a broad term for practices that train attention and awareness, usually in a set-aside session. Mindfulness is one particular quality, paying open, non-judgmental attention to the present moment, which you can cultivate in meditation but also carry into everyday life. So mindfulness meditation is meditation that develops mindfulness, while mindfulness itself can happen anytime, like while washing dishes. StillMind helps you build both, in formal sessions and in the small moments between them.