Little by little, Microsoft is adding to Windows Phone the features that are missing regarding Android and iOS. This time, it is the simple but always useful screenshot facility, something Windows Phone users have been asking for quite a long time.
While there's still no way to take an screenshot in Windows Phone 7 and 7.8 (the latest requires a jailbreak and a homebrew application), in Windows Phone 8 this is now built-in the OS (no need to install any app) and as straightforward as its competitors:
To take an screenshot just press the Start and Power buttons at the same time. The display will flash shortly, you'll hear the camera shutter sound and a notification "Saving to screenshots" will pop in your phone's display.
The screenshots are stored in the Pictures Hub and, from there, you can view, delete or even open the images for editing and sharing. This feature is available everywhere, so you can take snaps of every application, the Start Screen or even the Lock Screen. Whenever you need it, there it is.