During papal audiences with heads of state, the exchange of gifts comes after the private encounter and at the end of the event. It offers the press a chance to witness the body language of the two leaders and listen in as they explain their gifts.
It also offers a glimpse of what the two leaders think of each other.
For example, Pope Francis gave President Trump a large medallion depicting an olive branch as a symbol of peace.
The pope said, "I give this to you so that you can be an instrument of peace."
The president replied, "We can use peace."