Mobile applications, often called mobile apps, are software programs designed to run on smartphones and tablets. They can be downloaded from app stores like Apple's App Store or Google Play Store and serve various purposes, including communication, entertainment, productivity, and education. These apps are built for specific operating systems, such as iOS for Apple devices and Android for devices from various manufacturers. Mobile applications can be free or paid, and many offer in-app purchases or advertisements to generate revenue. They enhance user experience by providing convenient access to services and information on the go.