Ramadan is a holy month for Muslims who believe that it teaches them to practice self-discipline, self-control, sacrifice, and empathy for those who are less fortunate. As a result, Muslims are encouraged to exercise actions of generosity and compulsory charity (zakat).
During this month, Allah Almighty showers his blessings, gives rewards, and benefits to all those Muslims who fast with full devotion and faith.
The Muslims recite this dua (supplication) while breaking their fast, and ask Allah that they fasted for Him and believe in Him and break their fast with his sustenance.
You may also like to see Dua for Sehri / Roza rakhne ki dua (Supplication for keeping/starting fast)