Sep 272013

Question: what are CSS sprites?
Answer: a single image file containing a composite of several images.
Question: how are they used?
Answer: a common application is navigation where different sections of an image are revealed based on menu item states e.g. static, hover, selected.
If you’re not familiar with CSS sprites then this article is a great primer. Sprites are a powerful tool for front end designers. Learn about their advantages and how to use them.

The Mystery Of CSS Sprites: Techniques, Tools And Tutorials | Smashing Coding.