Activity trackers are devices designed to monitor and record various physical activities, such as steps taken, distance traveled, and calories burned. These gadgets often come in the form of wristbands or smartwatches, making them convenient for everyday use. Many models also include features like heart rate monitoring and sleep tracking, providing users with a comprehensive view of their health and fitness levels. By syncing with smartphones or computers, activity trackers allow users to set fitness goals, track progress, and receive personalized insights. Popular brands like Fitbit and Garmin have made these devices accessible to a wide audience, encouraging healthier lifestyles through technology.