So basically . what is a bark ???

Your friend has answered correctly. I want to add few points-  Bark is found on older stems and roots. It includes dead as well as some living part of  plant stem. It is used as a wood. It consist of cork (dead outermost protective tissue of older stem),cork cambium, cortex and phloem.

@Pokamatchi:- Good efforts, keep contributing!!

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They are tissues which are exterior to vascular cambium which includes secondary phloem and periderm.

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