The resolution of a digital image is measured by the number of pixels used
(one million pixels = 1 megapixel / 1 MP). Therefore cameras with a great
number of megapixels have the potential to produce better quality pictures.
It is always important to consider the intended use of the camera before
purchase. For example, a 1-2 megapixel camera will produce pictures of
sufficient quality to email to friends or for your eBay listings but not
particularly good for quality 11x14 prints on photo paper.
All new cameras should come with appropriate software & USB interface
(ie cord connecting camera and PC), allowing you to view your pictures
on your PC.