Have you ever seen one or more of your listings being displayed in the search results with "pad" in with the content of your description?
Have you ever run a keyword weighting report or used Google Webmaster Tools and found that the keyword "pad" is one of the most heavily weighted keywords?
Have you ever found yourself wondering just what a "pad" was? That's ok, you are not alone. "pad" is simply some extra padding in the alt image tags used by yahoo store. It's not needed and should be removed for optimum seo.
How do I know if it's a problem on my site?
The quickest and easiest way is to view the source code of your page and do a text search for 'pad'. If you see it as "alt" text anywhere then you should consider this enhancement.