They're supposed to reflect contributions to this online community board. You are given 30 treats a day to spend, voting on answers provided by other members. There is a plus sign and a minus sign on the left. If you click on the plus sign, you will be giving another member here 10 treats, but only 1 is subtracted from your daily allocation. There are several other recent threads about treats, which you may want to check out. Just do a search on "treats" or "voting."
This is from the FAQ linked above:
How does voting work?
When a question or answer is upvoted, the user who posted it will gain points, which are called Treats. These points serve as a rough measure of the community trust in that user. Various moderation tasks are gradually assigned to users based on those points.
Looking for more detail? Here's an example. Say you ask an interesting question or leave a helpful answer — your input will be upvoted. On the other hand, if the answer is misleading, it will be downvoted. Each vote in favor will generate 10 points, and each vote against will subtract 0 points. There is a limit of 2000 points that can be accumulated for a question or answer per day.
https://www.rover.com/community/quest...