Indonesian (Bahasa Indonesia) is the official language of Indonesia. Indonesian has been used as a lingua franca in the Indonesian archipelago for centuries. The Indonesian name for the language is Bahasa Indonesia (literally “the language of Indonesia”). This term can sometimes still be found in written or spoken English. In addition, the language is sometimes referred to as “Bahasa” by English speakers, though this simply means “language” and thus does not technically specify the Indonesian language (source: http://en.wikipedia.org/wiki/Indonesian_language).
Indonesian is simple, you pronounce the word as its written, and the grammar is not complicated. You can go to this site http://www.omniglot.com/writing/indonesian.htm, to know more about Indonesian alphabet and the pronounciation.[cel].