Language is a term that can be applied to any complex system of communication. Language may be subdivided into various categories, including spoken and written language, phonetic and body language, natural languages (e.g. German or English) and constructed languages (e.g. Esperanto or computing languages). There is a vast number of separate languages, each one serving as the basis for communication within a particular language community. Spoken languages are classified in language families according to their lineage. In general terms, using language means having the ability to speak or to communicate. The term also denotes the mode of its usage – spoken and written forms, style and articulation. Even in the animal kingdom, we see gesture systems and communicative activity that can be classed as language.