Aero Peek is a new feature introduced in Windows 7. If you have many windows open on your desktop, its quite easy to lose track of them. Aero Peek lets you ‘peek’ behind all the windows so that you can have a look at your Windows 10/8/7 desktop, should you wish to access any gadgets or shortcuts. It does so by making all the open windows go transparent. To do so, you simply have to move your cursor to the extreme right part of your taskbar and hold it there. Or else click Win+Space.
Aero Peek feature in Windows 10
If you press on that panel, all the open windows get minimized and your desktop is shown.
With Aero Peek, you can also choose to preview any particular open window, while hiding all the others.
To do so, move your cursor to the taskbar button which you want to preview. A taskbar preview, ie a small windows will appear.
Move your mouse over this small taskbar preview.
You will see all the open windows, except this one, get hidden.