
via
Through a particular place as an intermediate stop on a route.
Wir fliegen von Berlin via Frankfurt nach New York.
We are flying from Berlin via Frankfurt to New York.
via + accusative
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Through a particular place as an intermediate stop on a route.
Wir fliegen von Berlin via Frankfurt nach New York.
We are flying from Berlin via Frankfurt to New York.

Using a particular means or through a particular channel.
Bitte schicken Sie uns die Unterlagen via E-Mail.
Please send us the documents via email.
'via' (via) takes the accusative case. With place names without an article, the case is not visible; with a phrase containing an article, it can be identified.
Wir senden die Daten via einen geschützten Server.
We send the data via a secure server.
To describe a complete travel route, you can use the pattern 'von … via … nach …' (from … via … to …). The place name after 'via' (via) is used without an additional preposition.
Wir fahren von München via Innsbruck nach Verona.
We are traveling from Munich via Innsbruck to Verona.
In communication and data transmission, the expressions 'via E-Mail' (via email), 'via Internet' (via the internet), and 'via Satellit' (via satellite) are common. In these expressions, no article follows 'via' (via).
Die Messwerte werden via Satellit übertragen.
The measurements are transmitted via satellite.