Learn in the textbookIoT Devices and Information Terminals
DefinitionA personal digital assistant (PDA) (携帯情報端末) is the general term for a small device you carry around to view, enter and manage information.
ExplanationThe term first meant electronic organizers that handled schedules and address books, and today smartphones and tablets fill that role. In IoT, it is the window in your hand for checking information and operating devices. Because it runs on a built-in battery, battery capacity is given in mAh (milliampere-hours).
AnalogyThink of a notebook, a calculator and a map rolled into one tool that fits in your pocket.
Memory hookIts other name, PDA, stands for Personal Digital Assistant: picture a digital secretary you can carry.