When digital cameras first made their appearance, all you had to do to make the best purchase was to choose the camera with the highest number of megapixels. The camera with the most megapixels usually also had the best other components and features. Over the last few years, however, digital cameras have changed so rapidly and the number of megapixels has increased so dramatically that the number of megapixels is no longer an adequate indication of camera quality. In this tutorial we will show everything laypersons need to know before buying a digital camera.