If you have been using digital cameras for some time, you know that having sensors with a lot of megapixels can be very beneficial. Pixels are the basic blocks of digital images. The world pixel is a combination of words “picture element.” It became popular as digital images became more and more widespread. Pixels themselves 
are tiny dots that you can see on the computer screens and on the paper of newspapers and magazines, yet when you look at them from a distance, they create pictures that consist of continuous colors and tones.
Digital pictures consist of organized rows and columns of pixels, similarly to a checkerboard. For example, a 6 megapixel camera would have a checkerboard that is 3,008 pixels wide and 2,000 pixels tall. The area of this rectangle is 3,008 pixels times 2,000 pixels, which is a little over 6 million, or 6 megapixels. This is where the megapixel measurement comes from.
A camera with 24 megapixels would have a rectangle that has sides of 6,048 by 4,032 megapixels that represent light-sensitivity of the camera sensor. Exact numbers of megapixels may vary depending on the camera and sensor manufacturer.
