This screen is accessed from the back-end Joomla! administrator panel. It is used to check and fix any database issues with your website.
This checks that your database is up to date with your Joomla programs.
At the top right you will see the toolbar:
The functions are:
administrator/components/com_admin/sql/updates) that were not run during the version update. It then re-checks whether or not the database is up to date. If it is successful, the message "Database table structure is up to date" will show.
At the top left, you will see the following five links: