Bahasa Indonesia, a product of the nationalist movement, is the official language, serving as a common vehicle of communication for the various language groups. Based primarily on Malay and similar to the official language of Malaysia, it also contains many words from other Indonesian languages and dialects, as well as from Dutch, English, Arabic, Sanskrit, and other languages. In 1973, Indonesia and Malaysia adopted similar systems of spelling. Outside of Jakarta, only 10–15% of the population speaks the language in the home, but more than half the population uses it as a secondary language. Use of some 669 local languages persists, including Sundanese, Malay, and the most widely used, Javanese. English and Dutch are widely used in industry and commerce.
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