What is a Treat?

I have been using Rover for a couple months now and while looking through this Q&A Community I noticed that, next to my name, it says "(1 treat)". I clicked on my profile and on "treats" and noticed I have one treat as of today at "1.000". I've tried looking through FAQs and googling it but I haven't found any explanation as to what this is. So.....What are they, how do you get them, and what does the "treat change log" show you exactly?