Hey kiddo! So there was this group of people who lived in a place called Pliska in Bulgaria a long time ago. They had their own unique way of doing things, like how they spoke and ate their food. Later, they moved to a different city called Preslav and their way of life became even more special. They built big and beautiful buildings and made beautiful art. We call this way of life and all the things they did the Pliska-Preslav culture. It's like how you have your own way of doing things at home that's different from other people's houses. Cool, huh?