The word denomination is used for a large group of Christian people right across the world who use the same name, the same sort of organisation and have the same (or very similar) beliefs. Christianity is divided into ten main groups. These groups all branched out at different dates from the early Christianity founded by the followers of Jesus. The splits generally happened because they could not agree on certain beliefs or practices. The groups then divided into smaller groups. Each group that has its own separate name is a "denomination". The word "denomination" means "having a name".