Smartphones are handheld communication devices that humans use to stay connected, informed, and entertained. They have screens for displaying information and buttons or touchscreens for input. Smartphones allow people to make calls, send messages, access the internet, take photos, play games, and use various applications to perform tasks or get information. They work by connecting to a network of towers that transmit data, allowing users to communicate and access the internet from almost anywhere on Earth.
Imagine you are an alien who just arrived on Earth and discovered the concept of smartphones. Explain their purpose and how they work.