Question mark at the end of URL?

So, when I go into a level, The URL has a question mark at the end. for every level.
But it’s not part of the URL because when you copy/past it in the forum, The question mark is black, while the URL is blue like the link that it is. Does anyone know what’s going on?
~Andrew

It’s called a:

It’s used for adding extra info or a different mode to a URL. Here’s an example where it’s actually used (normally you don’t need it):
https://codecombat.com/play/spectate/dueling-grounds?session-one=5a6c9b71b1cf610029ae7fcc&session-two=5a6c9d34e6a3b9002f54c3fb

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wow, you really wrecked yourself.