An iPhone app refers to a software application specifically designed and developed for use on Apple's iPhone devices. These apps are available for download from the Apple App Store and offer various functionalities and features tailored for the iPhone's operating system (iOS). iPhone apps can serve a wide range of purposes, including entertainment, productivity, communication, gaming, social networking, health and fitness, education, and more. They leverage the capabilities of the iPhone, such as its touch screen interface, sensors, camera, and connectivity options, to deliver an enhanced user experience and cater to the needs and preferences of iPhone users.