Okay kiddo, so there's this thing called the Alexandrian Rite, which is a fancy name for how some people in certain churches do things when they worship God.
It all started a long, long time ago in a place called Alexandria, which is in Egypt. Some people who lived there wanted to worship God in a slightly different way than other people in other parts of the world did. They changed some of the prayers and songs that they said during church, and they also did things like stand up and sit down at different times.
Eventually, this way of worshiping God caught on and spread to other places too. Nowadays, there are still people who use the Alexandrian Rite in their church services. It's just one of many different ways that people can choose to worship God, but it's special because it has its own traditions and history.