The depot (repository) tree and the workspace tree share the tree pane. However, only one of them is visible at a time. Many actions can be performed from either tree view. As we see, there are certain context specific actions that reference information specific to either a depot or a workspace (but not both).
This is an example of Perforce using the word depot to mean the repository (which can contain multiple depots). We will call it a depot tree for consistency with P4V and Perforce documentation, even though it is better to think of it as a repository tree.
The depot tree tab presents information about files as the server understands them. In the following screenshot we see a depot called depot