relevant
Important, essential, or significant in a particular context.
Bitte nennen Sie nur die für den Fall relevanten Fakten.
Please name only the facts relevant to the case.

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Important, essential, or significant in a particular context.
Bitte nennen Sie nur die für den Fall relevanten Fakten.
Please name only the facts relevant to the case.

The adjective 'relevant' is almost always used with the preposition 'für' and the accusative. This construction indicates the context in which something is important or significant.
Diese Information ist für unsere Entscheidung sehr relevant.
This information is very relevant to our decision.
'Relevant' belongs to the word family of 'die Relevanz' (relevance). If you know the meaning of one word, you can easily understand the other. 'Die Relevanz' is the noun for 'die Wichtigkeit' (importance) in a particular context.
Die Relevanz dieser Entdeckung für die Medizin ist enorm.
The relevance of this discovery for medicine is enormous.
'Relevant' is often combined with nouns that describe information, data, or abstract concepts. Typical collocations are 'relevante Informationen' (relevant information), 'relevante Faktoren' (relevant factors), or 'relevante Aspekte' (relevant aspects).
Für die Bewerbung müssen Sie alle relevanten Dokumente einreichen.
For the application, you must submit all relevant documents.
important
'wichtig' and 'relevant' can both say that something needs to be taken into account. 'wichtig' is more general and can be used for almost anything that has a lot of significance. 'relevant' is used especially when something plays a role for a specific topic, question, or decision. Something can be important, but not relevant to a particular conversation. As a guide: 'wichtig' means great importance in general, while 'relevant' means suitable and important in exactly this context.

Am Morgen prüft mein Freund, welche Unterlagen für das Gespräch relevant sind.
In the morning, my friend checks which documents are relevant for the meeting.
Für die Prüfung ist regelmäßiges Üben wichtig.
Regular practice is important for the exam.