Raster image

A raster image is an image file defined as a grid of pixels. They're also referred to as bitmaps. Common raster image formats on the Web are {{Glossary("JPEG")}}, {{Glossary("PNG")}}, {{Glossary("GIF")}}, and ICO.

Raster image files usually contain one set of dimensions, but the ICO and CUR formats, used for favicons and CSS cursor images, can contain multiple sizes.