Without going into too many technical details, the number of Megapixels (MP) a camera has, the higher the quality of the image will be. This in turn will determine how large a print you can make before the print image starts to deteriorate.
Here is a simple guide to decide what is right for you.
Interchangeable Lens Camcorder
Two MP or less. This is typical of earlier digital cameras, many mobile phones or PDA's. Clearly, you cannot expect too much and I would not recommend this size for prints but you can get some passable results with small prints if you are not too fussy. On the other hand, this would be perfectly all right if you were mainly into emailing pictures or posting them on the web. Three MP This size is probably the best choice for the casual photographer being a good compromise between price and quality. You can expect to get good quality 6 x 4 in prints and reasonable 7 x 5 in prints even a fair 8 x 10 in. Four MP This is the point at which you can really expect good quality images and very decent quality prints up to 8 x 10 in. This size will meet the needs of the great bulk of photographers for almost all types of shots from family portraits to holiday shots and landscapes. Recommended for photographers to give good quality results for most normal purposes. Five MP This will give even higher quality images and nice prints up around 11 x 14 in. So, if you are into large prints, this size will do you nicely. This is also the minimum size that you can start to expect to sell your images to commercial outlets. Six MP This is where the quality really starts to kick in. You should be able to get quite high quality 11 x 14 in prints and possibly higher sizes. Ideal for framing or marketing to commercial outlets. Over Six MP This is where the professional level starts. You will get outstanding results but at a price. Before you opt for this option, ask yourself if the price is justified for the purposes you will be using it for.
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