
der Rückruf
callback
A phone call to someone who previously tried to reach you.
Ich habe Ihren Anruf verpasst, aber ich verspreche Ihnen einen Rückruf bis heute Abend.
I missed your call, but I promise you a callback by this evening.
callback / recall
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callback
A phone call to someone who previously tried to reach you.
Ich habe Ihren Anruf verpasst, aber ich verspreche Ihnen einen Rückruf bis heute Abend.
I missed your call, but I promise you a callback by this evening.

recall
A public request by a manufacturer for customers to return a defective or dangerous product.
Wegen eines Problems mit den Bremsen gab es einen großen Rückruf für das neue Automodell.
Because of a problem with the brakes, there was a major recall for the new car model.

recall
The instruction for a person to return to an earlier place or position, for example in the case of diplomats or soldiers.
Nach dem diplomatischen Eklat erfolgte der sofortige Rückruf des Botschafters.
After the diplomatic scandal, the ambassador's immediate recall followed.
The word is made up of 'Rück-' (from 'zurück', back) and 'Ruf' (from 'rufen', to call). So it literally means a 'call back', which fits all meanings.
Ich warte dringend auf einen Rückruf von meinem Arzt.
I am urgently waiting for a callback from my doctor.
The noun 'der Rückruf' (callback/recall) is derived directly from the separable verb 'zurückrufen' (to call back/recall). You can 'jemanden zurückrufen' (call someone back), 'ein Produkt zurückrufen' (recall a product) as a manufacturer, or 'einen Diplomaten zurückrufen' (recall a diplomat) as a government.
Der Autohersteller musste Tausende Fahrzeuge zurückrufen.
The car manufacturer had to recall thousands of vehicles.
The context makes clear which meaning is intended. If it is about telephoning, it is a call. If it is about products and companies, it is a product return/recall. If it is about politics or the military, it is the recall of a person.
Wegen eines Defekts gab es einen Rückruf für das Kinderspielzeug.
Because of a defect, there was a recall for the children's toy.
In the telephone context, fixed phrases such as 'um einen Rückruf bitten' (to ask for a callback), 'einen Rückruf erhalten' (to receive a callback), or 'einen Rückruf zusagen' (to promise a callback) are very common.
Könnten Sie Herrn Meier bitte um einen Rückruf bitten?
Could you please ask Mr. Meier to call back?
With product returns, people often say that a manufacturer 'einen Rückruf startet' (launches a recall) or that customers 'von einem Rückruf betroffen sind' (are affected by a recall).
Alle Kunden, die von dem Rückruf betroffen sind, erhalten eine E-Mail.
All customers affected by the recall will receive an email.
This meaning is used almost exclusively in formal, official contexts such as news or political reports. It usually concerns diplomats, ambassadors, or soldiers.
Die Regierung ordnete den sofortigen Rückruf aller im Ausland stationierten Experten an.
The government ordered the immediate recall of all experts stationed abroad.