If a graphically capable browser is being used, graphics in GIF or JPEG files format can be rendered as inline images, that is, integral to the Web page. Graphics in other formats can also be viewed in a separate window by launching an appropriate viewer program.
Graphics can greatly enhance the appearance of a page.
But appearance shouldn't be the main consideration. The function of graphics should be to help convey your information, to enhance content rather than simply make it look pretty. Look carefully at the graphics in your Web page. Performance Performance issues are an important aspect of the user interface to Web pages. The most common complaints about Web pages relate to the ill-judged use of graphics.