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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](<https://en.wikipedia.org/wiki/ICO_(file_format)>).
Raster image files usually contain one set of dimensions, but the ICO and CUR formats, used for favicons and [CSS cursor images](/en-US/docs/Web/CSS/cursor), can contain multiple sizes.