A 'screenshot' is a still, digital image, or 'snapshot' of what appears on all or part of a computer screen. Screenshots can be useful to diagnose problems and record screen events.
The best file formats to save screenshots are as a .jpg or .gif. Bitmaps (.bmp) are very large in comparison (often as much as twenty times as large) and are therefore not as convenient.
Windows Vista, Windows 7, Windows 8, or newer
Starting with Windows Vista, Microsoft introduced the Snipping Tool. The Snipping Tool lets you take snapshots of the entire screen, windows, or just parts of the screen: