The term killer application–commonly abbreviated to “killer app”–is often used in information technology circles to refer to a computer program that has become so indispensable or desirable that it justifies the purchase of computer systems or infrastructure purely in itself.

The advent of business computing networks and global Internet connectivity changed the computing landscape forever, but the term “killer app” prevailed, and is still applied to highlight software that drives purchase decisions.

For decades, big businesses held the mantra that “communication is key.” For modern global enterprises, this rule of thumb has required some updating, but the philosophy remains the same. Electronic communication platforms are now as diverse and numerous as business needs, but e-mail is the new killer app.

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