Tracker also enables GNOME Shell's search feature, which provides search results for applications and files, and returns values from supported applications (e.g. GNOME Calculator) and extensions.

https://wiki.gnome.org/Projects/Tracker/

Tracker is GNOME's analogue to Spotlight (from macOS/iOS) and Windows Search.

https://support.apple.com/en-us/HT204014

https://docs.microsoft.com/en-us/windows/desktop/search/wind...