Although taking a screenshot on an Apple iPhone is easy (simply simultaneously press the HOME and the POWER button), doing so on an Android phone is not. Some of the Android apps that take screenshots require you to root your phone. Those of us not willing to root our phones, are stuck with this rather cumbersome (but doable) procedure described in the following video using the free Android app No Root Screenshot It.
Feldman, Barbara. "How to Take a Screenshot on an Android Phone." Surfnetkids. Feldman Publishing. 18 Oct. 2011. Web. 20 Aug. 2014. <http://www.surfnetkids.com/tech/889/how-to-take-a-screenshot-on-an-android-phone/ >.