A tracking pixel is a graphic with dimensions of 1x1 pixels (small enough that visitors to the page shouldn't notice it!). It is loaded when a user visits a website and tracks user activities. In addition to the metrics that ThankView offers, you can use a tracking pixel to gather data for online marketing, analysis, or email marketing.
Here's a quick guide on how to get a tracking pixel:
Learn how to generate and install a Google Adwords pixel from this article: