Keyword SEO, how to bold and italicise?

usedciscodotcom asked:


For search engine optimization, I understand that bolding or italicizing specific keywords on a webpage help tell the search engines which words are important.
Can someone please tell me specifically how I code (html) those words or phrases so that the spiders know that they are being bolded or italicized?
In addition if we’re using css based layouts how would the spider know if they are surrounded by a “div” or a “span” tag?

Thanks

Las Vegas Internet Consulting