History

Indonesian is a normative form of the Riau dialect of the Malay language, an Austronesian (and Malayo-Polynesian) language originally spoken in Northeast Sumatra which has been used as a lingua franca in the Indonesian archipelago for half a millennium. It was elevated to the status of official language with the Indonesian declaration of independence in 1945, drawing inspiration from the Sumpah Pemuda (Youth's Oath) event in 1928. Indonesian was also influenced by the "bazaar Malay" that was the lingua franca of the archipelago in colonial times, and thus indirectly by the other spoken languages of the islands: Malaysian Malay claims to be closer to the literary Malay of earlier centuries even though modern Malay has been heavily influenced, in lexicon as well as in syntax, by English.
Whilst Indonesian is spoken as a mother tongue by only a small proportion of Indonesia's large population (i.e. mainly those who reside within the vicinity of Jakarta and other large predominantly Indonesian-speaking cities such as Medan and Balikpapan), over 200 million people regularly make use of the national language – some with varying degrees of proficiency. Use of the national language is abundant in the media, government bodies, schools, universities, workplaces, amongst members of the Indonesian upper-class or nobility and also in many other formal situations.
Standard and formal Indonesian is used in books and newspapers and on television/radio news broadcasts; however, few native Indonesian speakers use the formal language in their daily conversations. While this is a phenomenon common to most languages in the world (for example, spoken English does not always correspond to written standards), the degree of "correctness" of spoken Indonesian (in terms of grammar and vocabulary) by comparison to its written form is noticeably low. This is mostly due to Indonesians combining aspects of their own local languages (e.g., Javanese, Sundanese, Balinese, and Chinese dialects) with Indonesian. This results in various 'regional' Indonesian dialects, the very types that a foreigner is most likely to hear upon arriving in any Indonesian city or town. This phenomenon is amplified by the use of Indonesian slang, particularly in the cities.
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