The "quantified self" is a movement that encourages individuals to track and analyze various aspects of their daily lives using technology. This can include monitoring physical activities, sleep patterns, diet, and even mood. By collecting data through devices like fitness trackers and mobile apps, people aim to gain insights into their habits and improve their overall well-being. This approach often involves using metrics and statistics to make informed decisions about health and lifestyle choices. The quantified self movement has gained popularity with the rise of wearable technology, such as Fitbit and Apple Watch, which help users easily gather and interpret their personal data.