Okay, so let's imagine that you are playing a game of pretend with your friends where you are all very important leaders of different countries. One of your friends may be called the King, another may be the President, and so on.
Now, in some countries, there is a person called the Catholicos who is a leader of a group of people who follow a certain religion called the Armenian Apostolic Church. This person is like a special friend of God who helps people learn about and follow the teachings of their religion.
The Catholicos is chosen by other important leaders of the church, and they are usually very wise, kind, and knowledgeable about their religion. They also have a special hat, kind of like a crown, that they wear during important religious ceremonies.
So just like you and your friends have different roles and responsibilities in your pretend game, the Catholicos has an important job of leading people in their religious beliefs and helping them connect with God.