There Are Things Known, and Things Unknown, and In Between Are the Doors
Jim Morrison

Operating Systems

Android

Categories:

operating system with the Linux kernel for mobile devices such as mobile phones, smartphones, tablets (tablet PCs) and netbooks.

iOS

Categories:

Apple Inc. operating system for a mobile operating system for smartphones, electronic tablets, portable players and other devices (iPhone, iPod touch and iPad).

macOS

Categories:

a family of Unix operating systems produced and distributed by Apple Inc.