What function do ValueTrack parameters perform?
Create custom date segmentation
Dynamically insert information
Track additional conversion types
Automatically sync to Google Tag Manager
ValueTrack parameters are used to track information about the source of an ad click. By adding these parameters to your ads and campaigns, you can learn if people who clicked on your ads came from mobile devices, where they were located when they clicked your ads, and much more.
Read more here: https://support.google.com/google-ads/answer/6305348