
existierend
existing
Actually present, existing in reality.
Die Studie basiert auf allen existierenden Daten zu diesem Thema.
The study is based on all existing data on this topic.
existing
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existing
Actually present, existing in reality.
Die Studie basiert auf allen existierenden Daten zu diesem Thema.
The study is based on all existing data on this topic.
'Existierend' (existing) is the present participle of the verb 'existieren' (to exist). Like many present participle forms in German, it can be used as an adjective before a noun.
Alle existierenden Dokumente müssen geprüft werden.
All existing documents must be checked.
This adjective is used almost exclusively before a noun (attributively). Predicative use after verbs like 'sein' (to be) is very uncommon and sounds unnatural.
Die existierenden Regeln sind für alle verbindlich.
The existing rules are binding for everyone.
The word 'existierend' (existing) belongs to formal written language, technical language, or administrative language. It is rarely used in normal everyday conversation.
Der Plan muss an die bereits existierende Infrastruktur angepasst werden.
The plan must be adapted to the already existing infrastructure.
available / present
Both words can say that something exists in reality. “Existierend,” however, focuses more on mere existence, while “vorhanden” usually also suggests that something can be found or used. Use “existierend” when talking about something continuing to exist, and “vorhanden” for a concrete stock or supply.

Die noch existierende Brücke steht seit hundert Jahren im Tal.
The bridge that still exists has stood in the valley for a hundred years.
Die alte Brücke ist im Tal noch vorhanden, aber nicht mehr begehbar.
The old bridge is still present in the valley, but it can no longer be crossed.