What is the difference between meditation and mindfulness?

"Though it’s often a fine line, here’s the main difference between the two: Meditation is a large umbrella term that encompasses the practice of reaching ultimate consciousness and concentration, to acknowledge the mind and, in a way, self-regulate it. It can involve a lot of techniques or practices to reach this heightened level of consciousness — including compassion, love, patience, and of course, mindfulness. So mindfulness is a type of meditation, alongside tantra, yoga, sexuality, silence, breathing, and emptiness." Medical Daily

Here's a video on what's happening when you meditate.