What is iphone 5s ios 9.3?

The iPhone 5s was released in September 2013 running on iOS 7. It received several major software updates until it stopped receiving updates after iOS 12.4. However, it does support iOS 9.3, which was released in March 2016. iOS 9.3 introduced several new features and improvements, including Night Shift mode, which automatically adjusts the color temperature of the screen to reduce eye strain in the evening, and improved security features. It also introduced enhancements to the Notes app, such as the ability to add photos and sketches, and improvements to the News app. Overall, iOS 9.3 was a significant update for the iPhone 5s, bringing new features and improvements to the device and enhancing its overall functionality.