What are query strings?

Query Strings is a simple but powerful integration that allows you to generate dynamic images on demand by changing the query string of an image URL. 

Query Strings has now been succeeded by the more user-friendly Simple URLs ↗ (default state) which is now only available by downgrading your URL base. The functionality remains the same,but with an improved and more user-friendly method to construct modifications.

You start with a URL base and construct the modifications with strings of data according to your template's layers. Check out How do I generate images using query strings for steps on how this is done.