The fundamentals of digital and film cameras are the same when taking a picture. The big difference is that with digital photography you get instant results, as you can view your picture on the LCD screen of the camera. With a conventional camera, you have to wait for film processing to get the pleasure of seeing what you have taken.
With a digital camera you can delete the pictures you don't like, while film again requires you to wait, as well as spend time and money, on processing photos that you may not even want.
Electrical information is processed into digital information by the use of electronic chips in digital cameras. Millions of tiny receptors convert the energy into a digital image.
The color elements used are called pixels, and the standard pixel is the megapixel (MP). Megapixel identifies the number of sensors needed to convert the information into a digital image. A camera with 8 megapixels of resolution is equal to about 8 million sensors.
The higher the number of megapixels, the better resolution and better quality of the photo you will receive. Good quality 4 x 6 photos can be taken with a 1.9-megapixel camera.