Do Keywords in Bold or Italic help to increase search rank?
Some webmasters claim putting your keywords in bold or putting your keywords in italics may be a useful ranking factor in terms of search engine optimizing a page.
It's more true now than ever, that search engines value pages in the same way humans would (and do). If you publish a page that has very good content, then you will almost always be rewarded with higher search rankings. And, a big part of any good content is being able to be easily accessed or read by the person using your site. In other words, ease of use. To this finish, putting necessary words and phrases in bold or italics can make your pages easier to read.
Moreover, an oversized element of search engine rankings is links to your page from different influential websites. When you make pages easier to read, you’ll be raising the user's level of expertise and so increasing the chance that many will be linking back to your page. This indirect technique will increase search engine rankings (SEO) and is the solely method I feel bold and italics can have an effect on your page.