Okay kiddo, so you know how sometimes people have special jobs, like doctors and teachers? Well, back a long time ago, there were people in some religions who also had special jobs - they were called priests.
One type of priest was called a gala. These priests were important in a religion called Zoroastrianism. They had a very specific job - to perform ceremonies and prayers that were believed to protect people from evil spirits and help them connect with their gods.
The gala had to be very knowledgeable about the religion and the specific prayers and ceremonies they needed to perform. Sometimes they would wear special clothes and use special tools during their rituals.
Overall, the gala priests were a really important part of Zoroastrianism and played a big role in the religious traditions of the people who followed that religion.