What is the name of following technique:
When you search a multi word keyword, for example "download physics book edition 218324", the search engine finds a page from a website with exactly same parameters like:
Now because this is a very very specific query with a very specific number, it is sure that the page does not actually exist on that website, but it is generated dynamically according to that query. When you click on the above URL, it can lead to the search page of that website where that query has been copied.
What is name of this technique/method? and how is this done?