When a word is used to emphasise or lay emphasis on a noun, it is called an Emphatic Adjective.
- The very idea of living on the moon is impractical.
- One’s own deeds decide one’s future.
- The mountaineer is brave. The same (thing) is true of you.
- She is the only girl who helped me.
- The queen herself cooked food for the king.
In the above examples, the highlighted words very, own, same, only and herself emphasise the nouns idea, one’s deeds, (thing), girl and queen, respectively. Thus, they are emphatic adjectives.