Mandaism is a religion that believes in a bunch of special beings called "mandi". These mandi are like angels or spiritual leaders that can help people live good lives. They follow teachings from their holy book called the "Ginza Rba", which tells them how to live and connect with these mandi.
Mandaists also do special ceremonies where they immerse themselves in water to get rid of bad things and become closer to their mandi. They believe that their mandi can help them live a happy life and even guide them to the afterlife.
Mandaism is a pretty unique religion that not a lot of people know about. But for those who believe in it, it's a really important part of their lives.