vorhanden
available / present
Describes that something exists, is there, or is available. It is mostly used in more formal contexts.
Für die Veranstaltung sind ausreichend Sitzplätze vorhanden.
There are enough seats available for the event.

available / present
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available / present
Describes that something exists, is there, or is available. It is mostly used in more formal contexts.
Für die Veranstaltung sind ausreichend Sitzplätze vorhanden.
There are enough seats available for the event.

The word derives from 'vor der Hand' (at hand). It therefore describes something that is directly within reach, accessible, and available, as if it were lying right in front of you.
Bitte prüfen Sie, ob alle notwendigen Dokumente vorhanden sind.
Please check whether all necessary documents are present.
This adjective is almost always used predicatively, that is, after a noun together with the verb 'sein' (to be). Using it directly before a noun is rare and sounds very formal.
Es ist genügend Essen für alle Gäste vorhanden.
There is enough food available for all the guests.
'Vorhanden' (available/present) belongs to a rather formal or factual style of language. It is often found in written notices, technical instructions, or business contexts.
Die Software ist in mehreren Sprachen vorhanden.
The software is available in several languages.
there / since / then
'da' and 'vorhanden' can both express that something exists or is available. 'da' is very everyday and fits well in simple questions and answers. 'vorhanden' sounds more factual and is often used for things, documents, material, or options. Learners may confuse the words because 'vorhanden' often simply means 'da' (there / available). In conversation, people often say 'Ist genug Wasser da?' (Is there enough water?), while in a report you would more likely say 'Es sind genug Plätze vorhanden.' (There are enough places available.)

Im Lager sind noch genügend Ersatzteile vorhanden.
There are still enough spare parts available in the warehouse.
Für den Termin sind alle Unterlagen da.
All the documents are there for the appointment.