How to take screenshot in Nexus 7 and in most of the Phones [Without Root]

Hey Guys! Today I am going to tell you How to take screenshots in Nexus 7 and in most of the phones, Most of the people take screenshots by rooting the phone but I am going to tell you how to take without rooting

 So, in that case we have to press certain buttons.

Just press Volume Down+Power Button Together (see the images to understand better)