A smartphone application, commonly referred to as an app, is a type of software designed specifically for use on mobile devices such as smartphones and tablets. These applications can range from simple tools or utilities that perform specific tasks, to more complex programs that provide a wide range of features and services. Apps are typically available through various app stores, where users can browse, download, and install them onto their device. The term "smartphone application" refers specifically to an application designed for use on smartphones, as opposed to tablets or other types of mobile devices.