SEE APPLE'S PIVOTAL PRODUCT ANNOUNCEMENTS THROUGH HISTORY

Apple has a long history of designing products that aren't the first to be introduced in a particular category but still redefine the market.

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With the company unveiling a headset equipped with virtual and augmented reality technology already available in other devices, here is a look back at some of Apple's other breakthrough products:

THE MACINTOSH COMPUTER, UNVEILED JANUARY 1984

Heralded by a now-most famous TV commercial, the Macintosh computer lived up to the revolutionary promise made by Apple co-founder Steve Jobs during its 1984 unveiling. Among other things, the Mac ushered in the era of the graphical user interface (known as "GUI" in tech parlance) and the navigational mouse. In many ways, it was the first realization of Jobs' vision to turn computers into "a bicycle of the mind."

THE IPOD, UNVEILED OCTOBER 2001