What's all that "stuff" at the end of my URLs?

In looking at my Google Analytics, every time I see that someone has clicked on a link in one of my email blasts, the URL has a whole bunch of “stuff” tacked on to the end, making it cumbersome to review my stats. What is that, and how can I get rid of it? Thank you!

Ignore anything after the “?” in the url such as Example Domain

Unfortunately those need to be there for things to function, but you can always create reports inside Google Analytics to show you URLs without the parameters on the end.