A smartwatch is a wrist-worn computer that pairs with or extends a smartphone, packing a small touchscreen, sensors, and radios into a watch-sized case.1
Overview
A smartwatch is a tightly constrained wearable computer: a low-power SoC, a small display, Bluetooth and often Wi-Fi or cellular, and sensors such as a heart-rate monitor, accelerometer, and GPS receiver. It runs a purpose-built mobile OS — for example watchOS or Wear OS — surfacing notifications, fitness tracking, payments, and small apps. Everything is shaped by a tiny battery, forcing aggressive power management and, on many models, a daily charge.
Where it fits
The smartwatch sits at the smallest, most personal end of the mobile spectrum: not a replacement for a phone but a glanceable extension of it, and a hub for health sensors worn against the skin. Its sealed, battery-limited design makes it purely a consumer endpoint — useful as a remote notifier, not as a place to run real compute like an SDR pipeline.
Sources
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Smartwatch — Wikipedia, on smartwatch hardware and platforms. ↩