Theme states
One of the advantages of Drupal is the ability to have multiple themes available to use at any time, and as we discussed earlier, Drupal provides us with three themes to start with. However, it is important to differentiate between installed, uninstalled, and default. We can consider these as the theme's states.
Installed themes
Installed themes are always located in the Installed themes section of the Appearance admin and are available for Drupal to use for either the frontend or backend of the CMS. However, there can only be one theme set as the default at any given time. We can see a list of installed themes, as shown in the following image:
Uninstalled themes
Uninstalled theme(s) are themes that Drupal is aware of within the core ...
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