tracker
n. countablen. a tool or piece of software that follows the progress or movement of something. You might use one to watch your fitness goals or see where a package is.
n. an electronic device or software application used to monitor the location, progress, or performance of a specific subject. Often used in the context of logistics, personal health, or digital privacy.
I use a fitness tracker to count my daily steps.
The logistics company installed a GPS tracker on every truck to provide customers with real-time delivery updates.
Privacy advocates often warn that web trackers can build detailed profiles of individual browsing habits without the user's explicit consent or knowledge.
From track + -er.
Commonly used in compound nouns such as 'fitness tracker', 'package tracker', or 'ad tracker'.