The Bronze Age is the third and last prehistoric period and it begins when human beings start using metals, instead of stone, to create different tools, in a process called metallurgy.
The Neolithic is the second great period of Prehistory and it starts when humans discovered agriculture and farming to grow their own food, instead of just collecting and hunting.
Paleolithic, begins with the first appearence of the human being. During this period, people were nomadic, they were constantly on the move in search of animals to hunt and collected fruits found on the way.