"Green coffee" beans are coffee seeds (beans) of Coffea fruits that have not yet been roasted. The roasting process of coffee beans reduces amounts of the chemical chlorogenic acid. Therefore, green coffee beans have a higher level of chlorogenic acid compared to regular, roasted coffee beans. Chlorogenic acid in green coffee is thought to have health benefits. 

Green coffee became popular for weight loss after it was mentioned on the Dr. Oz show in 2012. The Dr. Oz show referred to it as "The green coffee bean that burns fat fast" and claims that no exercise or diet is needed.

People take green coffee by mouth for obesity, diabetes, high blood pressure, Alzheimer's disease, and bacterial infections.
 

How does it work?

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Green coffee beans are coffee beans that have not yet been roasted. These coffee beans contain a higher amount of the chemical chlorogenic acid. This chemical is thought to have health benefits. For high blood pressure it might affect blood vessels so that blood pressure is reduced.

For weight loss, chlorogenic acid in green coffee is thought to affect how the body handles blood sugar and metabolism.

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Source:  webmd