A smartphone is a portable electronic device that combines the functionalities of a mobile phone with advanced computing capabilities. Equipped with a touchscreen interface, smartphones allow users to make calls, send messages, browse the internet, and run various applications. They typically feature cameras, GPS navigation, and sensors, making them versatile tools for communication, entertainment, productivity, and everyday tasks. Smartphones are powered by operating systems like Android or iOS, offering access to app stores with millions of applications to customize the user experience.