What does the charge counter in battery indicates?

I have used the adb shell dumpsys battery command on my phone. It delivers the following results (posted on the image). Most of the terms, I can understand but not the charge counter. What does it indicate and why does it decrease whenever I connect my phone to the USB cable? What is the significance of charge counter for battery? I tried googling but cant find the answers. " class="img-fluid rounded" style="max-width: 100%; height: auto; margin: 10px 0;" loading="lazy">