Sure, see the Wikipedia article on UTM parameters.

Basically they allow companies to track how people arrive at their website. If they share a link on Twitter, for example, it could contain tracking parameters identifying Twitter as the original source, and/or the name of the company's current advertising campaign.

When someone clicks the link the website owner can check these parameters to see where that person came from (e.g. Twitter).

Identifying tracking parameters in links is straightforward once you know what to look for:

1. Anything beginning with utm_ is virtually always a tracking parameter and can be removed from the URL.
   
2. Clearly-named tracking parameters such as source, src, trk, referrer etc. can also be removed.
   
3. Other parameters whose values look nonsensical (e.g. huge strings of random characters) are often (but not always) tracking data too.
   
   Let's look at an example from an Amazon search for "teddy bear":
   
   https://www.amazon.com/Pluffins-Teddy-Bear-Plush-Stuffed/dp/B07HVM949Q/ref=sr_1_4?keywords=teddy+bear&qid=5543691232&sr=8-4
   
   In the above URL everything from /ref... onwards is unnecessary tracking rubbish and can be removed. ref probably tracks the section of the website the link was found; keywords contains the search term used to find the product. qid is probably "query id". sr is probably "source" meaning the position on the page where the product was seen (e.g. in a slideshow).
   
   The above URL without tracking parameters is:
   
   https://www.amazon.com/Pluffins-Teddy-Bear-Plush-Stuffed/dp/B07HVM949Q
   
   And it can actually be further shortened to:
   
   https://www.amazon.com/dp/B07HVM949Q
   
   So in summary a good rule of thumb is you can remove most text from a link which looks like garbage. If it looks worthless, it probably is.
   
   To further avoid such links you can use the following Firefox extensions, which attempt to remove known tracking parameters from URLs as you browse the web:
   
   

• ClearURLs
  
  
• Link Cleaner
  
  

  Reddit tracking
  

  
  While you're reading this, you should also know Reddit tracks the links you click too. You should:
  
  

1. Go to the Reddit preferences page.
   
2. Un-tick the box "allow reddit to log my outbound clicks for personalization"
   
3. Un-tick the box "allow my data to be used for research purposes"
   
4. Click the "save options" button
   
   You should also:
   
   
5. Visit Reddit's personalization preferences page
   
6. Un-tick all of the boxes on that page
   
7. Save