Keyword tags are the applicable keywords related with or allocated to a part of information. SEO keyword tags are not made for the visitors going through your web site but as source of information for the web spiders searching your web site. SEO tags are the ones who can make your web site rankings high or lay your web site in the last ranks of any search engine results page. SEO keyword tags are utilized by the search engines to compute the keyword density of the web site, which next assesses the relevancy of the web site's content to the general subject of the web page.
Although there are people who do not consider the SEO keyword tags important in the present context of technologies used in web sites such as Flash. But it should be remembered that SEO keyword tags and the Meta tags are the first things that web spiders notice as they crawl across your web site.
A lot of times people do not give importance to these SEO keyword tags as they are not able to understand their logic, but SEO keyword tags are of great importance for web spiders to find your web site for a specific search.