A texture atlas sometimes called a spritesheet is an image containing multiple smaller images. An atlas can consist of images of the same or different sizes. A sub-image can be drawn using the coordinates and size of the desired sub-image within the atlas.

A texture atalas is used when many small textures are used often and it is often more efficient to keep them in a texture atlas which is treated as a single unit by the graphics hardware. This decreases input output overhead. If the image atlas is compressed sub images can bleed into each other so precautions must be taken.

An example of the use of a texture atlas is web development where images are packed into an atlas or spritesheet in order to reduce the number of resource requests that need to be performed in order to display a web page.
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