finanzieren
to finance
To provide the necessary financial resources for an undertaking, a purchase, or a project.
Eine Bank hat uns den Bau des Hauses finanziert.
A bank financed the construction of the house for us.

to finance
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to finance
To provide the necessary financial resources for an undertaking, a purchase, or a project.
Eine Bank hat uns den Bau des Hauses finanziert.
A bank financed the construction of the house for us.

The verb 'finanzieren' (to finance) belongs to the word family around 'die Finanzen' (finances, plural) and the adjective 'finanziell' (financial). All of these words relate to money and its management.
Er hat seine Finanzen gut im Griff.
He has his finances well under control.
You can say not only what is being financed (accusative), but also for whom it is being financed. This person then appears in the dative.
Seine Eltern finanzieren ihm das Studium in Berlin.
His parents are financing his studies in Berlin for him.
Typically, large or expensive projects are financed. Common objects are: a house, a car, a degree program, a trip, or a company.
Wir finanzieren unser neues Auto mit einem Kredit.
We are financing our new car with a loan.
The reflexive form 'sich finanzieren' (to finance oneself) describes where a person or organization gets its money from. The source is usually indicated with the preposition 'durch' (through) or 'aus' (from).
Die Stiftung finanziert sich hauptsächlich durch private Spenden.
The foundation finances itself mainly through private donations.
to support
'unterstützen' and 'finanzieren' can both have to do with money. However, 'unterstützen' is broader: help can also be practical or material, and money is only one possibility. 'finanzieren' means more specifically that the necessary money for something is provided, or that something is paid for from a particular source of money. Learners may confuse the words when talking about financial help. If the type of help is open, 'unterstützen' fits better; if paying for something is clearly meant, 'finanzieren' is more precise.

Das Team hat die Reise durch Spenden finanziert.
The team financed the trip through donations.
Am Wochenende unterstützen wir unseren Freund bei der Renovierung.
At the weekend, we are helping our friend with the renovation.