County Durham is a special place in England where lots of people live. It is called a county because it is a part of England that has its own special leaders and rules. Think of it like a big club that only people who live there are a part of. Durham is also special because it has a really long history. That means that people have been living there for a very long time! There are lots of cool things to see in County Durham, like castles and museums, and people can also do fun things like go for walks and explore the countryside.