There are over 580 languages or dialects spoken in Indonesia, and 17,000 islands that comprise the nation. The official language, is Bhasa Indonesia, but Javanese, English and Dutch also have a high diaspora.
If you want to learn more about Indonesian language and culture, the sites below are a great start:
National Portal of the Republic of Indonesia: http://www.indonesia.go.id/en/indonesia-glance/symbol-and-the-state/national-language
National Geographic:http://travel.nationalgeographic.com/travel/countries/indonesia-facts/
Silk Screen Asian Arts & Culture Organization 