Indonesian is the official language of the Republic of Indonesia [1] and the national language of Indonesia. [2] Indonesian inaugurated its use after the Proclamation of Independence of Indonesia, precisely the day after, simultaneously with the entry into force of the constitution. In East Timor, the Indonesian language has the status of working languages. From the linguistic point of view, the Indonesian language is one of the many varieties of Malay. [3] The basis used is the Malay Riau (Riau Islands region now) [4] of the 19th century. In its development he experienced a change due to its use as a working language within the colonial administration and the various standardization process since the beginning of the 20th century. Naming "Indonesian" begins since the introduction of Youth Pledge, October 28, 1928, to avoid the impression "language imperialism" when the name of the Malay language remains in use. [5] This process led to the current Indonesian different from that used variants of Malay in Riau and Peninsula Malaya. Until now, Indonesian language is a living language, which continues to produce new words, either through creation or absorption of local languages ​​and foreign languages. Although it is understood and spoken by more than 90% of Indonesia, Indonesian language is not the native language for most speakers. Most of the citizens of Indonesia using one of 748 languages ​​that exist in Indonesia as a mother tongue. [6] Indonesian speaker often uses everyday version (kolokial) and / or mixing with other Malay dialect or mother tongue. Nevertheless, Indonesian language is used very widely in universities, in the mass media, literature, software, official correspondence, and various other public forums, [7] so that it can be said that Indonesian is used by all citizens of Indonesia. Phonology and grammar of Indonesian thought to be relatively easy. [8] The basics are essential for basic communication can be studied only within a few weeks. [9]