Multi-day devotion is a type of religious practice that involves devoting a certain amount of time to prayer and reflection over a period of several days. The term 'novena' is derived from the Latin word for nine, and it refers to a nine-day period of prayer and devotion. Novenas are often used in the Catholic Church as a way to honor a particular saint or to ask for a special favor. They can also be used to mark important occasions such as anniversaries or birthdays.