Okay, so imagine you have a big family, and you all speak a special language that not many people outside of your family know. Now imagine some of your family members moved far away to a new place where they didn't know anyone else who spoke your special language.
That's kind of what happened to the Kashubian people a long time ago. They lived in an area called Kashubia, which is now part of Poland. Many of them spoke Kashubian, which is a language that's kind of like Polish but also a little different.
But over time, some Kashubian people moved away from Kashubia to other countries around the world. They might have moved for opportunities or to be with family, but when they got to their new home, they found that not many people spoke Kashubian there.
So now there are Kashubian people all over the world, but they might not all speak the same language anymore. Some might have learned Polish or English or another language where they live. But even though they're far away from Kashubia, they still remember their heritage and culture. They might celebrate traditional holidays or eat special foods that remind them of home.
And that's what the Kashubian diaspora is. It's like a big family of Kashubian people all over the world who are connected by their shared history and culture, even if they don't all speak the same language anymore.