Ten Largest oil producing countries in the world

Oil is a the most precious usable and important source of energy in the world. Oil production means the sum of crude oil barrels extracted on daily basis through the drilling process. Most nations have Considerably effected by the innovations and developments in the oil market. Its need and consumption is  increasing day by day.its demand is increasing at highest rate in all over the world. In different nations it is produced through a process which may differ and sometimes same. different constituents are extracted from crude oil , such as petroleum, gasoline etc.