der Verweis
reference
A note pointing to another place in a text, another document, or another source of information.
Die Fußnote enthält einen Verweis auf die Originalstudie.
The footnote contains a reference to the original study.

reference / reprimand / expulsion
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reference
A note pointing to another place in a text, another document, or another source of information.
Die Fußnote enthält einen Verweis auf die Originalstudie.
The footnote contains a reference to the original study.

'Der Verweis' (reference / reprimand / expulsion) is the noun corresponding to the verb 'verweisen' (to refer / to expel). The different meanings of the noun correspond to the meanings of the verb: 'auf etwas verweisen' (to refer to something) and 'jemanden eines Ortes verweisen' (to expel someone from a place).
Der Autor verweist auf eine wichtige Studie.
The author refers to an important study.
You can recognize the meaning of 'Verweis' from the context. If it is about texts, books, or sources, it means a reference. In the context of school or work, it is a punishment. In sports, it means being sent off.
Im Anhang finden Sie einen Verweis auf weiterführende Literatur.
In the appendix, you will find a reference to further literature.
In the meaning 'Hinweis' (reference), the preposition 'auf' is almost always used with the accusative to name the target of the reference.
Der Text enthält zahlreiche Verweise auf historische Ereignisse.
The text contains numerous references to historical events.
In the context of a disciplinary measure, the typical verbs are 'einen Verweis bekommen/erhalten' (to get/receive a reprimand, from the perspective of the person being punished) and 'einen Verweis erteilen/geben' (to issue/give a reprimand, from the perspective of the authority).
Der Schulleiter erteilte dem Schüler einen strengen Verweis.
The principal gave the student a strict reprimand.
When exclusion from a place is meant, the preposition 'von' is often used with the dative to name the place that must be left.
Der Verweis vom Schulgelände galt für eine Woche.
The expulsion from school grounds was valid for one week.
link
'der Link' and 'der Verweis' can both lead to another place with information. 'der Link' fits especially on the internet or in digital documents because you can click it. 'der Verweis' is more general: it can appear in a book, in a text, in a footnote, or also in a file. Learners may confuse the words because a link is a kind of reference. As a practical rule: if you can click it, 'Link' is usually more natural. If it only points to another source, 'Verweis' fits better.

Im Text steht ein Verweis auf die Tabelle am Ende des Dokuments.
The text contains a reference to the table at the end of the document.
Kannst du mir den Link zur Anmeldung noch einmal schicken?
Can you send me the link to the registration again?