How is the program for URL shortening implemented?

How is the program for shortening the website URL implemented? Is there any way to achieve this? Is there any way to restore it back ?, Save the URL to the database and assign it an ID consisting of six characters. When used, find the original URL based on the ID and redirect the browser to this URL. The six-character ID can be used to distinguish a large number of URLs. ---------------------- How is the URL shortening program implemented?
Is there any way to achieve this? Is there any way to restore it back?

------ Solution --------------------
Save the URL to the database and assign it an ID consisting of six characters. When used, find the original URL based on the ID and redirect the browser to this URL.

The six-character ID can be used to distinguish a large number of URLs.


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