In the Internet world you have approximately 10 seconds to get visitors' attention. Using colours on your website or webpage can grab the user's attention.
Graphics can have the same effect.
Remember a picture is worth a thousand words. Graphics can include a picture taken by a camera or some artwork already available through graphic packages, cartoons or even your own drawings. It's important that your graphics are clear and easy to download. In general, the larger the dimensions of an image, the larger the file size of the image. If you have bookmarks and hyperlinks in your website or webpage, it is useful to highlight these using a different font, italics, or a different colour.