Because search engines cannot read and crawl the body contents and links of sites that are built with frames, framed sites usually don't score high in search engine rankings. If your website uses frames, the page should include a Noframes tag that will provide alternate content for search spiders and browsers that do not support frames.
The Noframes tag may contain a simple message and a link to a no-frame alternate site. Or, the tag can contain the entire HTML code, including links and body content, for the alternate site. The latter option secures that visiting search spiders can crawl the entire site, including all in- and external site links.