application / use
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application
The practical use or implementation of a method, knowledge, or rule in a concrete situation.
Die Theorie ist einfach, aber ihre Anwendung in der Praxis ist schwierig.
The theory is simple, but its application in practice is difficult.
'Die Anwendung' (the application/use) is the noun form of the separable verb 'anwenden' (to apply/use). It describes the process or result when you use something (e.g., a rule, a method, or a product) in practice.
Man muss die neuen Regeln korrekt anwenden.
You have to apply the new rules correctly.
Although 'Anwendung' (application) is often used like the English 'application' (e.g., for software), it never means an application for a job. For that, German uses 'die Bewerbung' (job application).
Er hat seine Bewerbung für die Stelle gestern abgeschickt.
He sent off his application for the position yesterday.
In connection with computers and smartphones, 'Anwendung' (application/app) is often combined with verbs like 'herunterladen' (to download), 'installieren' (to install), or 'starten' (to start/launch). It is a common word for 'App' (app) or 'Programm' (program).
Diese Anwendung hilft dir beim Organisieren deiner Fotos.
This application helps you organize your photos.
In a medical or pharmaceutical context, you can recognize this meaning from words like 'Salbe' (ointment), 'Creme' (cream), or the instructions 'zur äußerlichen/innerlichen Anwendung' (for external/internal use).
Diese Salbe ist nur zur äußerlichen Anwendung bestimmt.
This ointment is intended for external use only.
operation / effort / use
'der Einsatz' and 'die Anwendung' can both mean the practical use of something. They are especially close when talking about methods, techniques, or knowledge. 'die Anwendung' emphasizes more strongly that you put a rule, method, or knowledge into practice. 'der Einsatz' emphasizes more that you use a resource, tool, or material in a targeted way. The words can be confused because they sound similar in work and learning contexts. With rules and methods, 'Anwendung' is often more precise; with devices or materials, 'Einsatz' sounds more natural.
In der Prüfung ist die richtige Anwendung der Grammatik besonders wichtig.
In the exam, the correct application of grammar is especially important.
Der Einsatz von Tablets macht den Unterricht abwechslungsreicher.
The use of tablets makes lessons more varied.