There is a slight difference between the Fuzzy Select and Select by Color tools. Both of these tools will help you select areas of an image with the same or similar color. The difference is that the Fuzzy Select tool will only select an area of continuous color. If there are several areas in your image with the same color, but they are separated, the Fuzzy Select tool will only select one of them. The Select by Color tool doesn’t have this restriction, and should be used when trying to select all areas with the same color, regardless of whether they share a border or not.