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Digital photography brings with it a whole new set of terms and abbreviations that requires getting used to if you've been using film cameras in the past. Many of the terms are totally unique to digital cameras and photography, and if you don't understand them there is a good chance that you won't be able to get the equipment that you really need for taking digital photographs. So let's review some of the most important digital photography terms to help you understand them.
Pixel - everything in digital photography actually begins with the pixel. Simply put, it is the very smallest part of a digitized image. You can think of it as a.dot that when combined with lots of other dots around it, makes up an entire photo image
Resolution - this usually has to do with the total number of pixels in a photograph, and the higher the resolution, generally the sharper and better quality the picture is.
Megapixel - this simply stands for one million pixels. The more pixels that make up a photograph, the higher the resolution and better quality the image will be. So a digital camera that takes a one megapixel image will usually not have anywhere near the image quality of a camera that takes a four or five megapixel image. And the differences become even greater when the photograph is enlarged.
DPI - this stands for dots per inch and often applies to printers or monitors. For instance, most laser printers have a resolution of around 300 dpi, whereas most monitors display only 72 dpi. Photo quality inkjet printers usually come in at least 1200 dpi.