A mandala in Sanskrit means circle, and is a spiritual and ritual symbol in Hinduism and Buddhism, representing the universe.
In common use, “mandala” has become a generic term for any diagram, chart or geometric pattern that represents the cosmos, metaphysically or symbolically; a microcosm of the universe.
Mandalas are more than just an easy and fun way to draw something pretty. They are also a form of guided meditation. As you’re working in sections, it’s basically just making consistent marks in a pattern. You can start as simple as you like.