Using tracking pixels is a bit “old school” but is still used by some publishers and advertisers for tracking hits/users/etc.
So what is a tracking pixel?
A tracking pixel is a small 1×1 pixel image, often in gif or png form, that is inserted in certain pages/ads/forms so that the stats associated with the image can be used as an anlytical tool.
So how does it work?
Each element of a web page is loaded on the page after it is ‘requested’ from the server ‘serving’ the said page. Eg: When you load this page.. each single element(espec. images) are called as the page loads and then your browser puts it all together to make a page.
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