In the early days of the Web, browsers supported only GIF format images, until the JPEG format, a format which compresses the image file so that it takes up less disk space, was introduced. JPEG allows images to be displayed in millions of colors, while GIF supports only 256. However, most image special effects, like transparency and animation, are only supported by GIF format. In general, JPEG is better for photographs, and GIF is better for drawings and logos.
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