From Windows to OS X

Menu Bar

Windows: Application Menu

OS X: Menu Bar

Unlike Windows where the application Menu is only visible when an application is open. In OS X, the Menu Bar is always present at the top of the Desktop window and will change depending on which application is active and in the foreground.

As you can see in the screenshot above, the Finder was the active application at the time. You will also notice some other icons on the right side. Those icons represent other applications or features of the OS, like Spotlight.