A fitness tracker is a wearable device that monitors and records physical activities and health metrics. It typically tracks steps, distance, calories burned, and heart rate. Many models also monitor sleep patterns and stress levels. Fitness trackers sync with smartphones to provide detailed insights and progress reports. They encourage users to stay active and achieve fitness goals. Some include GPS for tracking outdoor workouts like running or cycling. Water-resistant designs make them suitable for all-weather use. With stylish looks and smart features, they double as everyday accessories. Fitness trackers promote healthier lifestyles through real-time feedback and motivation.