Generate meta tags

here is a link which you can use to create meta tags that will enhance your SEO.
Use this tool to generate meta tags fr your site
http://tools.seobook.com/meta-medic/

But tell me for what meta tags are used ????

i don't know what meta tag is but i will like to use that if it wil really help or improve my blogs.

Exceptionally Important: Your page title is the link that will appear in search results. Since it is what people click on in the search results and is the first thing people see about your site search engines place significant weight on it.
Usually best if left short ( 5 to 9 words, with most important parts in the first ~ 65 characters)
Each page should have its own unique page title.
Your primary keywords should occur early in your page title (from word position 2 to 5 or so).
Generic words such as "website home" or "welcome to" usually should not appear in your page title.
Don't forget to use relevant keyword modifiers in your page title to help draw in more relevant traffic.
Search engines such as Google may display the first ~ 65 to 70 characters from your page title in their search results.
Ensure your page title differentiates your site from competing sites.

Meta tags are HTML codes that are inserted into the header on a web page, after the title tag. In the context of search engine optimization, when people refer to meta tags, they are usually referring to the meta description tag and the meta keywords tag.