Oil is the most important natural resource in current time. It is being used from ancient times but as the time is passing and advancement in technology, the oil is being fully utilized.
There are many forms of oil. The products of oil starting from household oil to vehicle oil to oil used in big machinery. Oil has become the most important and widely used natural resource.
There is always a debate about oil extraction. Countries like Gulf and those in Middle East are self dependent in oil production but huge number of countries have to import. Here is a time fall chart of oil formation and its different kinds.
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Source: http://www.nerdgraph.com/history-oil/
