The requirements for capturing images for use on a web page are very different than those for printing high quality images on a photo quality printer. Some lower quality cameras use a CMOS sensor. The images captured by these cameras does not equal the CCD cameras. The sensor also determines the maximum resolution that the camera can capture. The higher the resolution, the higher the price of the sensor required to capture the image.
Resolution refers to the number of pixels or picture elements in a picture.
The pixel is the smallest bit of information about a recorded image. This is what is commonly called a 1.3-megapixel camera. This again depends on how the images are to be used. While a camera capable of capturing images with a resolution of 640x480 may be fine for adding pictures to your web site or sending e-photos of the new baby to family and friends, it will not give you images that equal the quality and size of standard film cameras. The higher the resolution, the more versatile the camera.