There are several mobile operating systems available, but the most popular ones are:
Android: Android is a mobile operating system developed by Google. It is based on the Linux kernel and is designed primarily for touchscreen devices such as smartphones and tablets. Android is the most widely used mobile operating system in the world, with a market share of over 70%.
iOS: iOS is a mobile operating system developed by Apple for its iPhone, iPad, and iPod Touch devices. It is a closed-source operating system, meaning that it can only be used on Apple devices. iOS is the second most widely used mobile operating system in the world, with a market share of around 25%.
Windows Phone: Windows Phone is a mobile operating system developed by Microsoft. It is designed to be used on smartphones and other mobile devices, and it features a unique user interface that is optimized for touchscreens. However, Microsoft has announced that it will end support for Windows Phone in December 2019.
Blackberry OS: BlackBerry OS is a mobile operating system developed by BlackBerry Limited for its BlackBerry line of smartphones. It is known for its strong security features, and it was popular among business professionals. However, BlackBerry has since shifted its focus to other areas, and its market share has declined significantly.
Others: There are several other mobile operating systems available, including Tizen, Sailfish OS, and Ubuntu Touch. However, these operating systems have a very small market share and are not widely used.
In summary, Android and iOS are the two most popular mobile operating systems, with a combined market share of over 95%. Windows Phone and Blackberry OS have much smaller market shares, and other mobile operating systems have a negligible presence in the market.