Press and hold the 'Home' and 'Power' buttons at the same time. The image will be saved with your photos.

For most Android devices, press and hold the 'Volume down' and 'Power' buttons at the same time. The image will be saved in your gallery app. If you have Android 9 or newer, you can also long press on 'Power' and tap 'Screenshot' instead.

On Samsung devices, press and hold the 'Home' and 'Power' buttons. The image will be saved in your gallery app.

Press and hold the 'Start' and 'Power' buttons at the same time. The image will be saved in the screenshots album in the Pictures Hub.

Press the 'Print screen' button (Print screen/SysRq), which can found in the top right-hand corner of the keyboard. When you press this it won't seem like anything has happened, but don't worry, that's normal at this stage.

Open an image program (such as Paint) or a word processor (such as Microsoft Word) and select 'Edit' from the options at the top of the page, then 'Paste'. Alternatively, just press 'Ctrl' and 'V'. Once you've done this, you'll see a picture of your screen saved in the document. Finally, save the file to a convenient location.

Press and hold the 'Windows' and 'Print screen' keys (Print screen/SysRq). On Windows 8, the image will be saved in the screenshots folder in your Photos app. On Windows 10, the image will be saved to the clipboard.

Press and hold the 'Command', 'Shift' and '3' keys at the same time. A full screen image will be saved on your desktop.