auswärtig
nonlocal
Not from this place; coming from another city, another region, or another country.
Für das Konzert kamen viele auswärtige Fans in die Stadt.
Many nonlocal fans came to the city for the concert.

nonlocal / foreign
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nonlocal
Not from this place; coming from another city, another region, or another country.
Für das Konzert kamen viele auswärtige Fans in die Stadt.
Many nonlocal fans came to the city for the concert.

The word is derived from 'auswärts' (away from here). The ending '-ig' turns it into an adjective. So 'auswärtig' describes a quality connected with 'coming from outside'.
Das Auto hat ein auswärtiges Kennzeichen.
The car has a nonlocal license plate.
In a political context, 'auswärtig' is used almost exclusively in the fixed expression 'das Auswärtige Amt' (the Federal Foreign Office). This is the name of the German foreign ministry.
Der Minister arbeitet im Auswärtigen Amt in Berlin.
The minister works at the Federal Foreign Office in Berlin.
'Auswärtig' is often combined with people or things that are not from the place where one is currently located. Typical examples are: 'auswärtige Gäste' (nonlocal guests), 'auswärtige Studenten' (nonlocal students), or in sports 'das auswärtige Team' (the away team).
Viele auswärtige Besucher kamen zum Stadtfest.
Many nonlocal visitors came to the city festival.
international
'international' and 'auswärtig' can both have to do with places outside one's own area. However, 'international' clearly means multiple countries or relationships across national borders. 'auswärtig' more often means: not from here, but from another place, another city, region, or sometimes another country. In fixed official expressions like 'Auswärtiges Amt' (Federal Foreign Office), it refers to foreign policy. Learners may confuse the words because both point "outward." When multiple countries are important, 'international' is more precise. When the point is simply that someone or something is not from this place, 'auswärtig' fits better.

Die auswärtigen Gäste übernachten nach der Feier im Hotel.
The nonlocal guests are staying at the hotel after the celebration.
Unser Team arbeitet international mit Partnern in Spanien und Polen.
Our team works internationally with partners in Spain and Poland.