Pixel's: On a computer monitor these are the very very tiny colored dots that make up the image you see. It takes Millions of these tiny Dots or Pixels to make an image. The more dots that are crammed into the image, the clearer the image is..
One indication of how good of quality the image that is captured on digital cameras is how many PIXELS the camera can record on the part of the camera that captures or records the image.
Entry level cameras have around 1 million Pixels so the image captured tends to be kind of Grainy or blurry. 1 mega pixel
The image can't be blown up and printed much more than 5x7 size without being real blurry/grainy... Web cams are an example.
Mid level cameras(what you want) have around 2 million pixels or 2 Mega Pixels and are pretty clear and the image can be blown up to 8x10 and still be pretty clear. $400 - $500
They can be rated and will be advertised as 2.1 megapixel= 2.1 million pixels can be captured.
Pro level cameras go up to 4 and above megapixels and cost $1,000.00-2,000.00 or more