URL query parameters are strings attached to the actual URL which you will see in your google analytics reports. This can be a query typed in the search bar or the UTM parameters attached.
If you see query parameters with the urls in the reporting, you may not be getting the accurate data. You will see duplicate URLs due to which your reports will be inaccurate.
The URL query parameter will look like
Here the string after the question mark(?) is search query and its attached to the actual url. You should exclude this url query parameter to avoid duplicate reports for the same URL.
By default Google Analytics removes the UTM parameters from page reports. To remove any other parameter attached to the url navigate to admin > view settings > Exclude URL Query Parameters
For entering multiple parameters separate by using a comma. The setting is case sensitive with a limit of 2048 characters.