Church Slavonic is a type of language that was used by people of the Eastern Orthodox faith, who lived in Eastern Europe, over 1000 years ago. It is a form of Old Church Slavonic, which is similar to Russian, Ukrainian, Polish, and other East Slavic languages. Church Slavonic is special because it was used in churches, so it was seen as a holy language. People spoke Church Slavonic so that God could understand them better during religious services, and to help bring people together in their faith. Church Slavonic is still used today, though not as commonly, in religious services and holy books!