Okay, imagine you and your family live in a house in a big city. But one day, something happens and you have to move to a different part of the city, far away from your old house. That's kinda like what happened to the Coptic people.
The Coptic people are a group that come from Egypt and they have a special religion called Coptic Christianity. But a long time ago, people in power in Egypt didn't like the Coptic Christians and made it hard for them to practice their religion. So, many Coptic people had to leave their homes and move to different parts of the world.
These Coptic people who left Egypt and now live in other countries are called the Coptic diaspora. It's like they are all part of a big Coptic family, but some members of that family live far away from each other.
Some Coptic people in the diaspora keep their culture and religion alive by going to Coptic churches in their new countries and holding special events to celebrate their traditions. They also try to help each other out and support each other, just like a family would.
In short, the Coptic diaspora is a group of Coptic people who had to leave their home country and now live in other parts of the world, but they still keep their unique culture and religion alive.