What is a Megapixel?

In this episode of Ask David I answer a question about what a megapixel actually is. I also talk briefly about how image sensors are structured and how they work. I also address how many megapixels are enough, too few, and too many. My Photography Website: http://www.5119photography.com/ Follow me on Google+: https://plus.google.com/+DavidHancock