What is the difference b/w petroleum refining and fractional distillation of petroleum ?

Distillation separates crude oil into a variety of groups by boiling them until they vapourise. The vpour is allowed to cool at different temperaturesin a huge tower. At each temperature, a number of hydrocarbons become liquid and separate out. These are called fractions and this process is known as fractional distillation.

Whereas, Separation of various components of petroleum is called refining.

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Arun (askIITians forum expert)