iOS is Apple's operating system for the iPhone and iPad. It's also the basis for tvOS for the Apple TV and watchOS for the Apple Watch. It's even beginning to infiltrate the Mac in some ways. Apple has worked hard to keep iOS private and secure, and it has a huge ecosystem of apps via its official App Store. Some have argued that it is too locked down, but the trade-off is that it's fast and stable for most users.
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Yesterday’s iPhone, today