Okay, kiddo, the Great Commission is a very important part of the Bible where Jesus tells his followers to go and spread his message to everyone in the world.
Just like how you share your toys with your friends at school, Jesus wants us to share his message of love, forgiveness, and hope with everyone we meet.
He wants us to tell people about him and how he sacrificed his life for us so that we can all have a happy and fulfilled life.
This is important because not everyone has heard of Jesus or knows about him, so it's our job as his followers to spread the word and help others understand.
This way, more people can be saved and find peace and happiness in Jesus. So, it's like going on a big adventure to tell people about Jesus and help make the world a better place, just like Jesus did when he was here with us.