13. The Apple Watch

Apple revealed the first Apple Watch at its September keynote in 2014, but the watch didn't officially go on sale until April 2015.

The watch was significant for Apple because it was the company's first brand-new piece of hardware since Apple cofounder Steve Jobs died in 2011. But it also sparked the growth of the wearables industry, a category Apple now dominates — the Apple Watch reportedly owns nearly 50% of the market share in 2019.

Since the Apple Watch's lauch, Apple has introduced several more versions, the latest being the Apple Watch Series 5 released in September.