As with any piece of software, it is quite possible that users might decide to remove a plugin from their WordPress installation if they no longer require the functionality that it provides or they have found an alternative that they prefer.
When this happens, the plugin author must decide if all of the configuration data stored in the site's database should be left in place, making it easier to re-install the plugin down the road, or to remove all of this information, leaving a clean database behind.
This recipe shows how to create a de-installation function that will remove options data from a site's database.
