Android KitKat is a version of the Android operating system, released by Google in October 2013. It was designed to improve performance and user experience on a wide range of devices, including smartphones and tablets. KitKat introduced a more streamlined interface, enhanced multitasking capabilities, and better memory management, making it suitable for devices with lower specifications. One of the notable features of Android KitKat is the integration of the Google Now voice assistant, which allows users to perform tasks using voice commands. Additionally, KitKat introduced the "OK Google" feature for hands-free voice activation, making it easier for users to access information and control their devices.