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The java script in web page or app send a message back to one of their or partner servers.
A big part of identifying you is capturing your screen info when you're browsers in full-screen. Never do this on your laptop monitor, or use Tor. Even with Tor, they purposely make your screen slightly smaller as this form of ID'ing is still possible.
Worse than that, they are used to sell information about you, specifically that you are a good target for spam because they know you open spam emails and don't have image auto-loading turned off in your email reader.
BTW, patrick.net emails have no such trackers which you should be able to verify by looking at the raw email text. On the other hand, I don't even allow valid images from my site to be displayed to email programs. That's a byproduct of some security maneuvering I did when being threatened by a copyright lawyer over an image of chicken tenders with Pepe the frog over them. I should fix that.