Colors, images, pictures, and graphics bring a lot of flavors to a web page. As you already know, a web page is in fact a text file equipped with HTML tags that a browser is asked to analyze, interpret, and render a result. Unlike in a word processor, a picture cannot be included on a web file. Instead, you tell the browser where the image is located, the browser will try to find it and then display it. This, of course means if you provide the wrong address, I mean if you don't clearly state where the picture is located, or if the browser doesn't find the picture where you said it was, there would be an error on your page.