In 1970s, the island underwent a major transformation from topologically forest area into a major harbor and industrial zone. The population drastically grew from a few thousand in the 1960s into the hundreds of thousands. Located in the direct proximity of Singapore and provided with cheaper labour forces, several Singaporean companies have established factories in Batam.
The official language on the island is Indonesian, but due to major Chinese population, Chinese dialects like Teochew and Mandarin are widely spoken, particularly in businesses. Apart from industrial zones, the islands have several resorts and tourist destinations.
Source:wikipedia