killer application

British  

noun

1. a highly innovative, very powerful, or extremely useful computer application; esp one sufficiently important as to justify purchase of the equipment or software

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Example Sentences

If so, the desperate search for a ‘killer application’ for quantum computers would be over.

From Nature

It disappointed until it found a “killer application” with the smartphone late in the decade.

From Economist

“Payments are the killer application. As soon as you can pay with it, more and more people will go ahead and get these.”

From The Guardian

Radar plus AIS is seen as something of a killer application in maritime policing.

From BBC

Perhaps quantum machine learning will also turn out to be a killer application — it has, at least, been an important motivator for big technology companies to invest in quantum computing.

From Nature