A tracker, in the digital realm, refers to a system or application designed to monitor and record specific activities, data, or movements. These tools are incredibly versatile, ranging from fitness trackers that monitor physical activity and sleep patterns to website trackers that collect user data for marketing and analytics purposes. Trackers can also be used for project management, issue tracking in software development, and even asset tracking in logistics. In essence, a tracker provides a means to observe, analyze, and report on a defined set of information, allowing for better understanding and optimization of the tracked process or activity.