tracker
Definition
A device, software, or system designed to monitor, record, or follow the location, movement, activity, or performance of a person, vehicle, animal, or data.
A person or animal trained to pursue and find quarry by following its trail or scent.
In finance, an investment fund or security that replicates the performance of a specific index or benchmark, such as an ETF.
Examples
My fitness tracker thinks I'm training for the Olympics, but it's just allergic to my Netflix marathons.
The pizza delivery guy swore his GPS tracker was on vacation, which explains why it took two hours to find our street.
Grandma's cookie tracker app now knows her entire family tree—turns out we're all just crumbs.
Investors love the index tracker; it's like following the market without the drama of picking winners yourself.