die Differenz
difference
The quantitative difference between two numbers or values, determined by subtraction.
Die Differenz zwischen 100 und 75 beträgt 25.
The difference between 100 and 75 is 25.

difference
Loading your saved state.
difference
The quantitative difference between two numbers or values, determined by subtraction.
Die Differenz zwischen 100 und 75 beträgt 25.
The difference between 100 and 75 is 25.

The plural form 'Differenzen' (differences) almost always refers to disagreements. The singular form 'die Differenz' (the difference), especially in connection with numbers, means the mathematical difference.
Die Differenzen zwischen den Parteien konnten nicht gelöst werden.
The differences between the parties could not be resolved.
To express the mathematical difference, the fixed structure 'die Differenz zwischen [Wert A] und [Wert B]' (the difference between [value A] and [value B]) is used.
Können Sie mir die Differenz zwischen dem alten und dem neuen Preis nennen?
Can you tell me the difference between the old and the new price?
In connection with conflicts, 'Differenzen' (differences/disagreements) is often used with verbs like 'haben' (to have), 'beilegen' (to settle/resolve), or 'überwinden' (to overcome).
Die beiden Kollegen hatten schon lange persönliche Differenzen.
The two colleagues had had personal differences for a long time.
difference
'Unterschied' and 'Differenz' can both mean that two values or things are not the same. In many everyday situations, 'Unterschied' is more natural and more general. 'Differenz' is used especially with numbers, prices, quantities, or measurements. It sounds a bit more factual and precise, often in mathematics, technology, or administration. Learners may confuse the words because 'Differenz' seems like a normal synonym. A simple rule is: for a comparison of characteristics, usually use 'Unterschied'. For numbers and calculations, 'Differenz' fits very well.

Die Differenz zwischen dem alten und dem neuen Preis beträgt zwölf Euro.
The difference between the old and the new price is twelve euros.
Habt ihr den Unterschied zwischen den beiden Reiseangeboten sofort bemerkt?
Did you notice the difference between the two travel offers right away?