The article presents a discussion on the concept of lingua franca. A language that is used as a medium of communication between people or groups of people each speaking a different native language is known as a lingua franca. Latin, associated with the rise of the Roman Empire, became the lingua franca of the Catholic Church and learning, while French used to be the language of international diplomacy, although it has largely been replaced by English. Being used in practically all spheres of international communication, that is politics, trade, industry science, entertainment and the world-wide web, English is today the world's most widespread lingua franca. A lingua franca can have different origins and forms. It can refer to a third natural language, as, for example, English in a communication between a Norwegian and a Chinese person; or it can be a pidgin language generally resulting from business transactions in the East and West Indies and Africa, as well as North and South America. A further manifestation of a lingua franca is exemplified by artificial or planned languages such as Esperanto or Frater.