Smartphones are handheld devices that combine the functions of a mobile phone and a computer. They allow users to make calls, send messages, and access the internet. Smartphones typically have touchscreens, cameras, and various applications, or apps, that enable activities like social media, gaming, and navigation. These devices run on operating systems such as Android or iOS, which support a wide range of features and services. Smartphones have become essential tools for communication, information access, and entertainment, making them a significant part of modern life.