Why Search Engines Dislike Flash Sites?

Search engines dislike Flash Web sites not because of their artistic qualities, because Flash movies are too complex for a spider to understand. Spiders cannot index a Flash movie directly, as they do with a plain page of text. Spiders index file names, and you can find tons of these on the Web, but not the contents inside.

Flash movies come in a proprietary binary format (.swf) and spiders cannot read the insides of a Flash file, at least not without assistance. And even with assistance, do not count that spiders will crawl and index all your Flash content. And this is true for all search engines. There might be differences in how search engines weigh page relevancy but in their approach to Flash, at least for the time beings, search engines are really united – they hate it but they index portions of it.