
bestehend aus
consisting of
Describes the composition of something; says which parts something is made of or which elements it contains.
Das Komitee besteht aus fünf Mitgliedern.
The committee consists of five members.
existing / consisting
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consisting of
Describes the composition of something; says which parts something is made of or which elements it contains.
Das Komitee besteht aus fünf Mitgliedern.
The committee consists of five members.

existing
Describes something that already exists or is present.
Die bestehenden Gesetze müssen dringend reformiert werden.
The existing laws urgently need to be reformed.
The word 'bestehend' is the present participle of the verb 'bestehen' (to exist / to consist). It is used like an adjective to describe a state or quality.
Die bestehenden Regeln sind für alle verbindlich.
The existing rules are binding for everyone.
In this meaning, 'bestehend' is almost always part of the fixed expression 'bestehend aus' (consisting of). The parts that something is composed of follow in the dative.
Das Team, bestehend aus Experten verschiedener Fachrichtungen, beginnt heute seine Arbeit.
The team, consisting of experts from various disciplines, begins its work today.
When 'bestehend' means 'existierend' (existing), it stands directly before a noun and is declined like a normal adjective.
Der bestehende Vertrag muss verlängert werden.
The existing contract must be extended.
In the meaning 'existierend' (existing), 'bestehend' is often combined with abstract nouns such as 'Gesetze' (laws), 'Regeln' (rules), 'Strukturen' (structures), or 'Probleme' (problems).
Wir müssen die bestehenden Probleme analysieren, bevor wir eine Lösung finden.
We need to analyze the existing problems before we find a solution.
available / present
Both words can refer to something that is already there. “Vorhanden” emphasizes that it can be accessed, while “bestehend” highlights the contrast with something that would have to be newly created. Use “vorhanden” for usable data and “bestehend” for data that already exists and will be reused.

Für den Bericht verwenden wir die bestehenden Daten statt neue zu sammeln.
For the report, we are using the existing data instead of collecting new data.
Für den Bericht sind bereits genügend Daten vorhanden.
There is already enough data available for the report.