
das Interesse
interest
The mental involvement, attention, or curiosity that one brings to a thing or person.
Sein Interesse für alte Autos ist wirklich bemerkenswert.
His interest in old cars is really remarkable.
interest
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interest
The mental involvement, attention, or curiosity that one brings to a thing or person.
Sein Interesse für alte Autos ist wirklich bemerkenswert.
His interest in old cars is really remarkable.

interest
The personal advantage, benefit, or concerns of a person, group, or organization. Often used in the plural.
Das Unternehmen handelte nur im eigenen wirtschaftlichen Interesse.
The company acted only in its own economic interest.

to be interested in
A fixed expression used to express that you are interested in something specific or would like to acquire or do something.
Ich habe großes Interesse an der ausgeschriebenen Stelle.
I am very interested in the advertised position.
The fixed expression 'Interesse haben an' (to be interested in) is always used with the preposition 'an' and the dative. It expresses what you are interested in or what you want.
Er hat Interesse an einem neuen Auto.
He is interested in a new car.
'Interesse' (interest) is often combined with certain verbs. Common expressions are 'Interesse wecken' (to arouse interest), 'Interesse zeigen' (to show interest), and 'das Interesse verlieren' (to lose interest).
Der Trailer hat mein Interesse für den Film geweckt.
The trailer aroused my interest in the film.
When you direct your attention toward something, you can use the expression 'Interesse zeigen für' (to show interest in). The preposition 'für' is always followed by the accusative.
Sie zeigte schon als Kind großes Interesse für Musik.
Even as a child, she showed great interest in music.
In the meaning 'Vorteil' (advantage) or 'Belang' (concern), the plural 'die Interessen' (interests) is often used. This is typical in political or economic contexts.
Der Politiker muss die Interessen aller Bürger vertreten.
The politician must represent the interests of all citizens.
attention
Interesse and Aufmerksamkeit can both be directed toward a Vortrag. Interesse refers to intellectual curiosity about or engagement with the topic; Aufmerksamkeit is the current concentration of one’s thoughts and senses. An interesting topic arouses Interesse, while a difficult explanation requires Aufmerksamkeit.

Die Zuhörer zeigen großes Interesse am Thema des Vortrags und stellen viele Fragen.
The audience shows great interest in the topic of the talk and asks many questions.
Während einer schwierigen Erklärung richten die Zuhörer ihre volle Aufmerksamkeit auf den Vortrag.
During a difficult explanation, the audience directs its full attention to the talk.