The Oscan language is an ancient way of talking that some people in Italy used a very long time ago. It's like when you go to a different country and they talk in a way that sounds a little different than you're used to.
People who spoke Oscan lived in what we call Italy today, but they lived there a really long time ago, like thousands and thousands of years ago. There weren't any big cities or things like that back then, and people would just live in small towns and villages.
When they talked in Oscan, it sounded very different from the way we talk today. They used different words and sounds, kind of like how a baby might talk in their own special way.
Nowadays, nobody really speaks Oscan anymore because it's such an old language. But people who study history and languages can still learn about it and try to understand how people used to talk a very long time ago.