Okay, so you know how when you go to church, there's a part called the "last gospel"? It's basically the part at the end where the priest reads a story from the Bible about when Jesus came to Earth and did some really important things.
The story is called the "prologue of John" and it's about how Jesus is God, and how he came to Earth to be with us and save us from our sins. It's a very important story that helps us understand why we celebrate Christmas and why we believe in Jesus.
Sometimes, the last gospel is read in Latin, which is another language that people used to speak a long time ago. But no worries, you don't really need to understand the Latin part to know what the story is about! Just listen carefully to what the priest says and try to remember the things Jesus did for us.