Informally and formally. The former would be more like conversations with God and often prone to distractions especially when done in the course of the day and alongside the day's activities. But those distractions eventually become part of the prayer.

The latter would be contemplative and in private where the heart can be fully contrite, humbled and grateful. I still pray the rosary on my knees as part of my devotion to Our Lady of Fatima.
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