Explain Screen modes in Adobe photoshop?

Do This	To Change to This Screen Mode	What‘s Happening
Press Shift+Tab.	Hide all panels.	All the panels in your working space — except for the Tools panel — vanish. When you need to access them again, press Shift+Tab again.
Press the Tab key.	Hide all panels and the Options bar.	All the panels (including the Tools panel) and the Options bar vanish, leaving you with a clean workspace showing only the Menu bar, Application bar, and any open documents (on the Mac, the Application bar may not display).
Select the Screen Mode button in the Tools panel.	Full Screen mode with Menu bar.	Only the active document window is visible, along with the panels, Menu bar, Application bar, and Options bar. The document window is maximized, and the other documents are hidden.
Select the Screen Mode button in the Tools panel.	Full Screen mode.	View the image alone with all other components hidden.
Select the Screen Mode button in the Tools panel.	Standard Screen mode.	The default Photoshop screen appears, displaying all menus and panels.

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