The Connections navigator lists all our database connections created by us. A double-click on each of those database connections will open the database connection for us using the saved credentials for that particular database. Objects are grouped into nodes in the Connections navigator to reflect their types. They are ordered by most commonly used with Tables, Views, and Indexes at the top of the list. You can refer to the following screenshot to see the grouping, order, and some of the currently available types displayed in the Connections navigator. The selection of browsable object types available increases with each release as the SQL Developer team adds support for more features. SQL Developer allows you to explore the contents of your database using the connection tree.
A complete list of supported database object types can be seen in the following screenshot:
