Summarize this article:

Note: You can click the “+” sign to the right of the top row to create a new Desktop.  Click any window to automatically exit out of Mission Control and bring the window to the foreground. Note: Windows from the same application will be bundled together.
Click the square in the upper left corner of the top row labeled “Dashboard” to access your Dashboard widgets. View your desktop spaces to the right of Dashboard in the top row. View your currently running full-screen apps to the right of your desktop spaces in the top row. View standard-sized windows and your main desktop below the top row in the lower section of Mission Control.