When you are printing a photo you want to print it at the appropriate quality for the size print you want. But what determines the quality of your prints? Is it the dots per square inch (DPI) or the number of pixels per square inch (PPI)?
In short the lower the number of pixels the more likely the print will look hazy. So when taking a photo with a digital camera is it something you need to look at. The more pixels per square inch your camera can take, the sharper the image will be.
When you start printing your own photos from your home computer you will want to take a look at how many dots per square inch your printer can print. This is something almost outdated since new printers have such good print quality that it can handle very high DPI prints.