what's the diffrence between the VGA or a megapixel And then what is QVGA, CIF, QCIF etc...?

Answer 1

Video Graphics Array (VGA) is an analog computer display standard. The term VGA is often used to refer to a resolution of 640×480, regardless of the hardware that produces the picture.
A megapixel is 1 million pixels, and is used not only for the number of pixels in an image, but also often to express the number of sensor elements of digital cameras or the number of display elements of digital displays. For example, a camera with an array of 2048×1536 sensor elements is commonly said to have "3.1 megapixels" (2048 × 1536 = 3,145,728).
The Quarter Video Graphics Array (also known as Quarter VGA or QVGA) is a popular term for a computer display with 320 × 240 resolution.
CIF (Common Intermediate Format) is used to standardize the horizontal and vertical resolutions in pixels of YUV sequences in video signals.
QCIF means "Quarter CIF".
All of this is from Wikipedia (a free, on-line encyclopedia). See the links for the full articles.