The main promotion in search engine keywords that the site:

1) do not overdo it, otherwise your page just to spam will assign
2) specify the search engine on what precisely these words are key. Well, as long as it works well, and you can use it. But believe my experience, it is long. Soon, the search engines no longer look the other way, or a mind (we have already tried this with a description and keywords). So go to the third and main point underscores the importance of keywords for a particular site. How to promote website in search engines.