vernichten
to destroy
To destroy something completely so that it no longer exists.
Das Feuer hat leider alle alten Dokumente im Archiv vernichtet.
Unfortunately, the fire destroyed all the old documents in the archive.

to destroy / annihilate
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to destroy
To destroy something completely so that it no longer exists.
Das Feuer hat leider alle alten Dokumente im Archiv vernichtet.
Unfortunately, the fire destroyed all the old documents in the archive.

The word derives from 'zu nichte machen' (to reduce to nothing). It literally means to turn something into 'Nichts' (nothing). This explains why the word has such a strong and final meaning.
Ein Computervirus kann alle Daten auf der Festplatte vernichten.
A computer virus can destroy all the data on the hard drive.
'Vernichten' (to destroy/annihilate) is a very strong word and expresses total destruction or an absolute defeat. It is much more intense than, for example, 'kaputt machen' (to break) or 'besiegen' (to defeat).
Die Flutwelle drohte, das ganze Dorf zu vernichten.
The tidal wave threatened to destroy the whole village.
The prefix 'ver-' is inseparable. It remains firmly attached to the verb stem in all tenses and sentence constructions.
Der Sturm hat die gesamte Ernte vernichtet.
The storm destroyed the entire harvest.
The object of the sentence reveals the exact meaning. If it is about physical things (files, buildings), it is about destruction. With opponents (team, army), it is about total defeat. With abstract things (reputation, hope), it is about moral destruction.
Er hat aus Wut alle Briefe von ihr vernichtet.
Out of anger, he destroyed all the letters from her.
to receive / preserve / support
'erhalten' and 'vernichten' are opposites here. 'erhalten' means that you protect something and make sure it continues to exist or remains in good condition. 'vernichten' means that you destroy something completely so that it no longer exists. The contrast is especially clear with nature, buildings, documents, or old things. You 'erhalten' something when it is supposed to stay; you 'vernichten' something when it is supposed to disappear completely.

Nach dem Projekt vernichten wir die alten Kopien mit vertraulichen Daten.
After the project, we destroy the old copies containing confidential data.
Der Verein möchte den alten Park für die Nachbarschaft erhalten.
The association wants to preserve the old park for the neighborhood.