Prehistoric or nirleka (nir: no, negligent: writing) is a term used to refer to the period in which the written historical record is not yet available.
Prehistory can be said to be originated at the time of formation of the universe, but is generally used to refer to the period in which terdapatkehidupan on Earth where humans started living.
Boundary between the prehistoric times to the era of history is to start the writing. This raises the notion that prehistoric era before the invention of writing is, while the history is the era after the writing.
The end or the beginning of the prehistoric era to the history of every nation in the world is not the same depending on the civilization of the nation. One example is the Egyptians around 4000 BC people already familiar with writing, so at that time, the Egyptians already entered the era of history.
Prehistory in Indonesia is estimated to end in the establishment of the Kingdom of Kutai, around the 5th century; evidenced by the inscription in the form yupa found on the banks of the Mahakam River, East Kalimantan, has just entered the era of history.
Because there is no written record remains of prehistoric times, information about age was obtained through such fields as paleontology, astronomy, biology, geology, anthropology, archeology. In the sense that the evidence of pre-history is only obtained from the goods and the bones in the excavation of historical sites.
