iOS is a smartphone and tablet OS created and developed by Apple Inc exclusively for the iPhone, iPad and iPod Touch etc…. It is the world’s 2nd most widely used mobile operating system, after Android. iOS is the basis for 3 other operating systems made by Apple i.e. iPadOS, tvOS, and watchOS.
The “iOS” logo & name are trademarks of Apple that impose standards to limit the use of the iOS trademark to “non-certified” devices outside of their ecosystem.
Apple’s iOS devices come with preinstalled Apple apps including Apple Maps, Email, FaceTime, Podcast, Wallet, Health, TV and many more.
Siri is an intelligent personal assistant integrated into Apple’s iOS. The intelligent personal assistant uses a natural language user interface & voice queries to answer questions, makes recommendation, and perform actions by delegating requests to a set of Internet services.
iOS 13 is the current most recent release of the iOS mobile operating system developed by Apple Inc. for their iPhone, iPod Touch, and HomePod lines, the successor to iOS 12 on those devices.