What is the idea behind the mandala?

Could you please elaborate on the concept behind the mandala? Is it a symbol of unity and harmony, or does it hold a deeper spiritual meaning? Are there specific cultural or religious connotations associated with it? How is it used in meditation practices and what role does it play in promoting mindfulness and balance? Additionally, are there any particular techniques or rituals involved in creating or working with mandalas? I'm eager to understand the full scope and significance of this fascinating art form.