What is the difference between Neolithic and the chalcolithic age?

the transition from the use of stone to metal was slow and gradual.people learn to use copper,gold, silver and finally iron.in Europe,the neolithic age was followed by the bronze age,but in India it was not so.in north India,people switched to copper from stones for making axes,spears etc.this period after the neolithic age when copper was used along with tiny stone implements is termed as Chalcolithic age.

neolihic age means new stone age