How can an image url be 84000 characters long?

Question

URL Handling

Got a plt.scatter plot in anaconda
And decided to copy its url to share it.
I could not insert anywhere until I realized that it had 84,000 characters.
The question is how and why?

Answer 1

Maybe the whole picture is encoded in the URL, as is done with WolframAlpha formulas, for example.

Answer 2

This is the url in base64