What happens when you drag a window to the top of the windows 7?

When you drag a window to the top of the screen in Windows 7, it automatically maximizes to fill the entire screen. This feature, known as "Aero Snap," allows for quick window management. If you release the window before reaching the top, it will return to its previous size and position. To restore it, you can drag it back down or double-click the title bar.