A project is a collection of files and folders that make up a Java applet or application. You must define a project before you begin creating and editing Java source files within Eclipse. The Package explorer panel lists projects that are defined in the workspace. You may define a project, then remove it from the workspace, however, the files and folders may still be on a disk. You can import a previously defined project back into the workspace (it will then reappear in the Package explorer). See the next section, Project, for details.
When done working on a project, you can right-click the project name in the explorer and choose Close project from the popup menu.