Tracker
In short
A tracker is a device or software used to monitor the position, movement, or progress of an object or person.
In plain words
It follows something and tells you where it is or what it is doing. It can be a small physical gadget or a digital tool on your phone.
A simple example
A GPS tracker attached to a pet's collar helps owners find them if they wander off. A delivery tracker shows you exactly where your parcel is on a map.
Why it matters
Trackers provide safety by helping find lost items or people. They also help businesses manage fleets and improve efficiency.
Easy to mix up
Do not confuse a tracker with a sensor, which measures qualities like heat rather than location.