Original: A chaplain is typically a priest , pastor , ordained deacon , rabbi , imam , other member of the clergy , or another representative of a faith or belief , serving a group of people who are not organized as a mission or church , or who are unable to attend religious services for various reasons , such as health , confinement , or military or civil duties .
Simplified: They usually serve a group of people who are not organized as a mission or church , or who are unable to attend church for many reasons , such as poor health , confinement , or military or civil duties .