When starting Eclipse you are prompted for the directory that will hold your projects. The default directory is called workspace.

Your first screen is the welcome window. Also, notice the prompt asking if you'd like to send your Eclipse usage statistics to the Subeclipse team. You can decline by clicking cancel or accept by clicking OK. The welcome window offers new Eclipse users opportunities to view an overview of Eclipse, work through tutorials, try sample programs and to find out what's new with this version of Eclipse. For now just close the welcome window.

This is the Eclipse IDE (Integrated Development Environment) otherwise known as the Workbench. The Workbench contains a menu bar and several smaller windows called Views.