iOS is a mobile operating system developed by Apple.

apple first announced this system at Macworld conference on January 9, 27. it was originally designed for iPhone, and later it was applied to iPod touch and iPad. IOS, like Apple's macOS, belongs to a Unix-like commercial operating system.

originally, this system was called iPhone OS, and since the iPad, iPhone and iPod touch all use iPhone OS, it was announced in WWDC in 21 that it was renamed as iOS(iOS is a registered trademark of Cisco's network equipment operating system in the United States, and Apple's renaming has been authorized by Cisco).

introduction of iphone:

iPhone is a series of mobile phones with iOS operating system released by Apple Inc

As of July 221, Apple Inc has released 28 mobile phone products, the first generation: iPhone, the latest version: iPhone 12 mini, iPhone 12, iPhone 12 Pro,? iPhone 12 Pro Max； Is the mute button of iPhone series on the left side of the front of the device? ; Before the iPhone 5, the model used a 3-pin (that is, a 3-pin) interface, and after the iPhone 5 (included), the product used a Lightning interface.

the iphone series models are equipped with Apple Silicon self-developed chips since the iPhone 4. Touch ID first appeared on iPhone 5s; IPhone 6s and iPhone 6s Plus added 3D Touch pressure-sensitive touch on the screen for the first time; Wireless charging first appeared in iPhone8 and iPhone 8 Plus models, and Qi(Chee) wireless charging standard was adopted.