Static widgets result from the functionality and configuration in the core. This is, for example, the widget with the configured fields for browsing or the configured options for faceting.
Automatic widgets result from functionality that is always available as a sidebar widget. An example is the map, which - once created and configured - can be embedded either in the content area of a CMS page or in the sidebar.
Individual widgets are, for example, HTML widgets or RSS feeds that have been limited to a subset using a Solr query.