Operating System (OS) is the software that manages the hardware and software resources of a mobile device. It provides a platform for mobile applications to run on and enables communication between the hardware and software components of the device. The most common mobile operating systems are Android, iOS, and Windows.

Hardware refers to the physical components of a mobile device, such as the processor, memory, storage, display, camera, and sensors. These components work together to provide the necessary functionality for mobile applications to run smoothly. The hardware specifications of a device can impact the performance and capabilities of mobile applications.

Mobile applications are software programs designed to run on mobile devices. They are developed using programming languages and frameworks that are compatible with the device’s operating system and hardware. Mobile applications can be downloaded and installed from app stores or other sources, and they can provide a wide range of functionality, from entertainment and social networking to productivity and business tools.