There are a couple of reasons you might want to take a screenshot (screen capture or screen grab) of your desktop or an application window. One of the most common is to send the image to tech support to show a problem you’re experiencing.
Look for the Print Screen Key on your keyboard, this might be labelled PrtScn
In new versions of Office you need to use the Windows Logo key as well as the PrnScn key
To take a screenshot and save it as a file
Press the Windows logo key+PrtScn. Or, if you’re using a tablet, press the Windows logo button + the volume down button.
The screen will dim for a moment when the screen is copied and saved as a file in the Screenshots folder (which is in your Pictures folder).
To take a screenshot (without saving it)
A picture of the screen is copied and you can paste it wherever you’d like.
To take a screenshot of only one window
Tap or click the window you want to capture.
A picture of the window is copied and you can paste it wherever you’d like.
In older versions of Windows, such as Vista and Windows 7 if you press the PrtScn button everything you see on your screen, including all open windows will be copied and placed on your clipboard. You will now need to paste the picture into a picture editing software like Paint and save the file. This will make it easy to attach to an email later if you need to.