“A creole language, or simply a creole, is a stable language that originates seemingly as a nativized pidgin…. While it is arguable that creoles share more grammatical similarities with each other than with the languages they phylogenetically derive from, no theory for explaining creole phenomena has been universally accepted. The relationship between pidgins and creoles and their similarities means that the distinction is not clear-cut and the variety of phenomena that arise to create pidgins and creoles are not understood very well. Likewise, efforts to articulate grammatical features (or sets of features) that are exclusive to creoles have been unsuccessful thus far.”
– Wikipedia