Learn in the textbookTypes and Characteristics of Computers
DefinitionA smartphone (スマートフォン) is a handheld device that combines a mobile phone's calling function with the abilities of a computer whose functions grow as you add apps (アプリ).
ExplanationYou operate it by touching the screen directly, and one unit packs in networking, a camera and GPS for finding your location. What it can do depends on the apps you install, so it can work as a map or as a way to pay.
AnalogyIt is like a toolbox that fits in your pocket, and you can add tools to it later.
Memory hookSmart means clever, and a smartphone is a phone that got clever.