The resolution of an image is expressed in dots per inch (dpi) (punts per polzada (ppp)). The resolution indicates the number of dots or pixels there are in a specific length of image. Bigger resolutions give us images of better quality. This is important when we acquire images with a digital camera or a scanner. With a scanner we can choose the resolution of the scanned image, but with a camera we can't. That's why the resolution is an important feature to check before buying a camera.
