Hey kiddo! So, Norse-Gaelic is a term that describes a very special mix of two different cultures: the Vikings, who came from Scandinavia (which is up North in Europe), and the Gaels, who lived in places like Ireland and Scotland.
When the Vikings went on their travels and raids, they sometimes ended up settling down in places where the Gaels lived. This happened a lot in places like the Hebrides, which are a group of islands off the coast of Scotland.
When they lived together for a while, the Vikings and the Gaels mixed their languages and their cultures. It was kind of like a big game of "let's trade things!". For example, the Gaels might have taught the Vikings some words in their language, and the Vikings might have taught the Gaels some new skills like metalworking.
This mixture of both cultures is what we call Norse-Gaelic. It's really interesting to study because it shows how different people can come together and learn from each other!