Take a picture of the screen
Screenshot (image of how the screen looks) or Print Screen can be done in an easy way, and it is pressing PrtScn located on the keyboard. Then you get a picture of the entire screen.
Parts of the screen
If you hold the Alt key when you press PrtScn (Print Screen), only the window you open will be captured.
However, to use the screenshot you must first paste it into an image editing software such as Paint (included with Windows) or Adobe Photoshop and use it or save the screen to use it later or send to someone by e-mail.