What are main features of Apple iOS?

Main features of Apple iOS are:

Home Screen - Home screen is first screen displayed after you open your iPhone. It displays a list of icons representing apps that you can run your iPhone. If you have more apps to display on the home screen, you can have a second home screen accessible by swiping the screen horizontally. The home screen appears whenever you unlock the iPhone or whenver you press the physical "Home" button.

Notification Center - Notification center holds all notifications received from different apps on your iPhone. If you taps on a received notification, the application that sent the notification will be opened to display the event related to the notification. You can access the notification center any time, even when the home screen is locked, by wiping down the top edge of the screen.

App Switcher - App switcher allows you to view all apps that are currently running on your iPhone. If you tap on an app on the app switcher, the app will resumed on the screen. If you swip an app upward on the app switcher, the app will be terminated. To access the app switcher, you need to double-click the physical "home" button".

Siri - Siri is a personal assistant and knowledge navigator, which can be directed by the your spoken commands. You can use Siri to call or text someone, open an app, search the web, lookup sports information, find directions or locations, and answer general knowledge questions (e.g. "How many cups are in a gallon?").

Control Center - Control center groups some commonly used tools and apps together and provides easy and quick access to them. You can access the notification center any time, even when the home screen is locked, by wiping down the bottom edge of the screen.

⇒ News Features of Apple iOS 10?

⇐ What Is Apple iOS?

⇑ iOS - System Software for iPhone

⇑⇑ Apple iPhone - Frequently Asked Questions