This is the 1484th most frequent German word.
super
Excellent; great; fantastic.
Here, 'super' is used as an adjective to express high quality or excellent appearance.
Dein T-Shirt sieht super aus.
Your T-shirt looks great.
In this sentence, 'super' acts as an adverb emphasizing the positive experience of the concert.
Das Konzert war wirklich super!
The concert was really great!
Here, 'super' intensifies the adjective 'schnell' (fast) to highlight exceptional speed.