Here's Why Apple Isn't Building an Amazon Echo Rival

In terms of sales, the iPhone is clearly Apple's most important product. But a relatively unsung hero for the company is Siri, its voice-activated digital assistant. While Siri is primarily available on iPhones, it has also made its way to Macs, the Apple TV and automobiles via Apple's CarPlay platform. Taken together, these steps all mean that if you're a heavy Apple user, Siri is probably always at your beck and call. That's important for Apple as Silicon Valley's battle over voice-activated artificial intelligence apps continues heating up: Microsoft has Cortana, Google has Google Now, and Amazon has Alexa.