Since each image takes time to download, having many unnecessary pictures and icons will make the user wait for your page to appear, and they wonUt want to return. Only include images that significantly improve the appearance and usability of your documents. Sometimes, text can convey more information than pictures. There are many file formats in which graphics can be stored. A simple, compressed, raster image format, which works well for simple graphics such as logos, diagrams, and icons.
Filenames end in .gif.
Also called simply JPEG, after the Joint Photographic Experts Group, who developed the standard. Very good for photographs and other images with realistic color. Supported by most graphics capable WWW browsers. Filenames end in .jpg or .jpeg. Size in Bytes.