super
Used as an adjective or interjection to express that something is excellent, great, or very good.
Das Essen im neuen Restaurant war einfach super!
The food at the new restaurant was simply super!

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Used as an adjective or interjection to express that something is excellent, great, or very good.
Das Essen im neuen Restaurant war einfach super!
The food at the new restaurant was simply super!

A special feature of 'super' is that, as an adjective, it is often not declined, even when it comes before a noun. In colloquial speech, it simply keeps the form 'super'.
Das war ein super Film.
That was a super film.
'Super' is a colloquial word. In formal texts or very polite conversations, other words such as 'ausgezeichnet' (excellent) or 'hervorragend' (outstanding) are often used.
Deine neue Frisur sieht super aus!
Your new hairstyle looks super!
As an adverb, 'super' simply means 'sehr' (very) and stands directly before the adjective or adverb it is meant to intensify. This use is also very colloquial.
Die Prüfung war super schwer.
The exam was super hard.
The positive meaning of 'super' is also found in many nouns where 'Super-' serves as a prefix to mark something as especially large, good, or powerful.
Wir kaufen die Getränke im Supermarkt.
We buy the drinks at the supermarket.
very
'sehr' and 'super' can both intensify an adjective, for example in 'sehr gut' (very good) and 'super gut' (super good). 'sehr' is neutral and fits everyday life, work, and formal texts. 'super' sounds more casual and often more enthusiastic. It fits especially well in spoken language or informal messages. The words can be confused because 'super' sometimes functions like 'sehr'. In an application, a report, or a polite email, 'sehr' is usually safer.

Bei der Feier war die Stimmung super gut, obwohl es draußen geregnet hat.
At the party, the mood was super good, even though it was raining outside.
Vor der Reise solltest du sehr genau auf die Abfahrtszeit achten.
Before the trip, you should pay very close attention to the departure time.