In neuropsychology, linguistics, and the philosophy of language, a natural language or ordinary language is any language that has evolved naturally in humans through use and repetition without conscious planning or premeditation. Natural languages can take different forms, such as speech or signing. They are distinguished from constructed and formal languages such as those used to program computers or to study logic.

Natural language can be broadly defined as different from

artificial and constructed languages, e.g. computer programming languages
constructed international auxiliary languages
non-human communication systems in nature such as whale and other marine mammal vocalizations or Honey bees' waggle dance.[2]
All varieties of world languages are natural languages, including those that are associated with linguistic prescriptivism or language regulation. (Nonstandard dialects can be viewed as a wild type in comparison with standard languages.) An official language with a regulating academy such as Standard French, overseen by the Académie Française, is classified as a natural language (e.g. in the field of natural language processing), as its prescriptive aspects do not make it constructed enough to be a constructed language or controlled enough to be a controlled natural language.