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DPI stands for dots per inch and refers to how a picture is constructed during the print process. During printing, ink is sprayed across the page in a series of dots. Higher numbers of dots per inch result in more ink and more definition. So the higher the DPI, the more definition and clarity an image will have.

Also, the higher the resolution or DPI, the larger the file. If you have a 4" x 6" image, and it's only 40Kb, you can be certain that it has a low resolution, like 72 DPI. That same file at 300 DPI would be closer to 1.5MB.

If images from your web site were used, they would look like the photo below on the left. If this were a person, rather than fruit, you would be unable to determine anything specific in their features.  

Example - Which of these photos do you want representing your company?

 

Chart of maximum resolution based upon megapixel count (400 Edition print standard is highlighted):

 

Megapixels	Pixel Resolution*	Print Size at 300ppi	Print Size at 200ppi	Print Size at 150ppi**
3	2048 x 1536	6.82" x 5.12"	10.24" x 7.68"	13.65" x 10.24"
4	2464 x 1632	8.21" x 5.44"	12.32" x 8.16"	16.42" x 10.88"
6	3008 x 2000	10.02" x 6.67"	15.04"' x 10.00"	20.05" x 13.34"
8	3264 x 2448	10.88" x 8.16"	16.32" x 12.24"	21.76" x 16.32"
10	3872 x 2592	12.91" x 8.64"	19.36" x 12.96"	25.81" x 17.28"
12	4290 x 2800	14.30" x 9.34"	21.45" x 14.00"	28.60" x 18.67"
16	4920 x 3264	16.40" x 10.88"	24.60" x 16.32"	32.80" x 21.76"
35mm film scanned	5380 x 3620	17.93" x 12.06"	26.90" x 18.10"	35.87" x 24.13"

 

*Typical Resolution. Actual pixel dimensions vary from camera to camera.

**At 150ppi, printed images will have visible pixels and details will look "fuzzy".

 

Chart courtesy of Walton Press.