Also known as Aero Peek, the Peek option in Windows allows you to preview the desktop when you move your mouse over to the Show desktop button at the end of the taskbar.
The one in the very bottom corner at the right, usually.
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Peek is turned on by default in Windows 10, and this option is useful for quickly viewing desktop icons or folders when you’d rather not minimize all open windows and then restore them again. However, you can turn it off if you want.
The two easiest ways to do this are from the Show Desktop Button, or the shiny new Settings app.
For the former, simply right-click or press and hold the Show desktop button at the end of the taskbar, the one just to the right of the clock.
Click or tap on Peek at desktop to check or uncheck the option, which turns on or off the feature.
Alternatively, you can also accomplish this in the Settings app by selecting the Personalization icon, and sliding the Use Peek to preview the desktop when you move your mouse to the Show desktop button at the end of the taskbar toggle on or off.
Your selection should be in effect now.
No obvious advantage to turn off this feature.