Fitness trackers and smartwatches measure activity, heart rate, sleep, and other health metrics throughout your day. People choose these devices for different reasons—some want to track workouts, others monitor daily steps or sleep patterns, and some use them mainly for notifications and convenience. The right device depends on what you actually do and what information matters to you.

These articles explain how to match a tracker or watch to your needs, from battery life and water resistance to which health metrics are worth tracking and which features you'll actually use. You'll learn what different sensors measure, how to compare options across price ranges, and whether a basic tracker or a full smartwatch makes sense for your routine.