The language spoken in Indonesia is called Bahasa Indonesia, which is the offical language of the country meant to standardize the way people speak throughout the country. However, since Indonesia is one of the most diverse countries in the world, with plenty of local languages (or dialects), most people speak Bahasa Minang in West Sumatra. Luckily, Bahasa Minang is not that different from Bahasa Indonesia. For example, terima kasih or "thank you" in Bahasa Indonesia is terimo kasih in Bahasa Minang. While English is also common in the touristy area in which I live, Korean is beginning to gain popularity with local students. K-pop is also very popular in Indonesia!
The type of money or currency used in Indonesia is the rupiah. This comprises colorful bills and different sized coins that range from 500rp to 100,000 rp (the highest). While most Indonesians carry bills and coins, there are plenty of ATMs around the city which cater to tourists from other islands in Indonesia, neighboring Asian countries, and Europeans (particulary Dutch).
