A "creole" is a special type of language. It originates when two monoglot communities live in close proximity. Elements of each will 'borrow' useful words from the other; working their way up to idioms and grammatical structures as things progress. Eventually, the dominant language will be so changed that it's origional home won't understand the new version. "Creole French" is an obvious example. Swahili and "pigeon English" are also creoles. When Prince Charles was introduced to the Parliament at Port Moseby in Papua/ New Guinea, the man said: "Bimby, long come number one son b'long Mizz Queen." Lest any one scream prejudice, Pidgin is the official language there.

The same kinds of things happen in all human endevours.