Image resolution is the amount of detail an image can hold. The higher the resolution, the better quality the image will be. A low resolution image will turn out blurry if enlarged. We see this now in the difference between standard definition and high definition (HD) television channels.
My friend found this for me to share with you. Most of you will recognize the image on the right (the “high resolution” Mona Lisa, with lots of detail). The image on the left is a contemporary artist’s take on the Mona Lisa, in a lower resolution.
If you take any image and stretch it too big, eventually it will look like the “low res” Mona Lisa. That is why photographers and graphic designers must be careful about the images they use and the resolution of their work.