Prehistoric period is that period of our ancient past for which we do not have written records. Therefore, knowledge of the cultures, which developed in this period, based only on the materials found in the archaeological excavations.
The earliest man living during this period made tools and implements of stone found in his surroundings. These tools helped him to hunt and gather food in order to satisfy his hunger. Since the earliest tools used by humans were made of stones, this phase of human development is known as the Stone Age.
In this period, we trace the evolution of prehistoric man from a hunter and food-gatherer to a food producer. This change did not take place all of a sudden and took several hundred thousand years. On the basis of the different type of tools and techniques the stages of human development in prehistoric period are described as the Palaeolithic or Old Stone Age, the Mesolithic or Middle Stone Age, and the Neolithic or New Stone Age.