Fitbit fitness trackers are wearable devices designed to monitor and promote physical activity. They track various metrics such as steps taken, distance traveled, calories burned, and heart rate. Many models also offer features like sleep tracking and guided breathing exercises, helping users maintain a balanced lifestyle. These devices sync with a smartphone app, allowing users to view their progress and set fitness goals. Fitbit offers a range of models, catering to different needs and budgets, making it accessible for anyone looking to improve their health and fitness.