
die Treue
loyalty / fidelity
The quality of being steadfast, loyal, and reliable toward a person, cause, belief, or promise.
Er hat seine Treue zu diesem Verein über viele Jahre bewiesen.
He has proven his loyalty to this club over many years.
loyalty / fidelity
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loyalty / fidelity
The quality of being steadfast, loyal, and reliable toward a person, cause, belief, or promise.
Er hat seine Treue zu diesem Verein über viele Jahre bewiesen.
He has proven his loyalty to this club over many years.

faithfulness
Exact correspondence with a model, original, or the facts.
Die historische Genauigkeit und Treue zum Detail in diesem Film ist beeindruckend.
The historical accuracy and faithfulness to detail in this film is impressive.

good faith
A legal principle that requires contracting parties to behave honestly, fairly, and considerately.
Das Gericht entschied, dass die Kündigung gegen den Grundsatz von Treu und Glauben verstieß.
The court decided that the termination violated the principle of good faith.
'Die Treue' (loyalty / fidelity) is the noun corresponding to the adjective 'treu' (loyal / faithful). If you know what 'treu' means, you can easily derive the meaning of 'die Treue'.
Ein treuer Freund ist ein Geschenk.
A loyal friend is a gift.
'Treue' is often combined with certain verbs. The most important fixed combinations are 'jemandem die Treue halten' (to remain loyal to someone), 'jemandem die Treue schwören' (to swear loyalty/fidelity to someone), and 'die Treue brechen' (to break one's loyalty/fidelity).
Die Fans halten ihrem Verein auch in schlechten Zeiten die Treue.
The fans remain loyal to their club even in difficult times.
Loyalty to a person or thing is expressed with the preposition 'zu' and the dative. In the expression 'jemandem die Treue halten' (to remain loyal to someone), the person is also in the dative.
Ihre Treue zu ihren Prinzipien war bewundernswert.
Her loyalty to her principles was admirable.
'Nach Treu und Glauben' (in good faith) is a fixed term from legal language. It describes the expectation that contracting parties behave honestly and fairly. It is used almost only in formal or legal contexts.
Man muss im Geschäftsleben nach Treu und Glauben handeln.
In business, one must act in good faith.
accuracy
Treue assesses how well a representation corresponds to the original or the facts. Genauigkeit, by contrast, emphasizes that individual details are precise, correct, and error-free. Treue fits a reproduction or rendition, while Genauigkeit is more suitable for exact details.

Die Treue der Übersetzung zum Original überzeugte die Leser.
The translation’s faithfulness to the original impressed the readers.
Die Genauigkeit der übersetzten Zahlen überzeugte die Leser.
The accuracy of the translated figures impressed the readers.