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Wrapping food in foil helps to cook it evenly by distributing heat homogeneously and preventing it from burning too quickly. 

It also helps to retain moisture, creating a more humid environment around the food, which can reduce moisture loss and shorten cooking time. 

While wrapping in foil can prevent charring and add flavor from smoke, it can also cause the food to steam rather than grill. 

This technique is often used for low and slow barbecue to help the meat overcome the "stall" and finish cooking without drying out.