The All in One SEO plugin for WordPress makes optimizing your site's Title and Meta tags simple. This popular plugin gets thousands of downloads per day.
Search engines and best practices expect certain things of our Title tags and Meta description tags.
Title Tag (that's the part that appears at the top of the browser window)
These should be descriptive of the content of the page, should include your important keywords for that page, and if you think about it, should be written to look appealing.
Meta Description (this is hidden in the source of your page)
<meta name="keywords" content="seo, wordpress, plugins, all in one seo, title tag, meta description, meta keyword, on page optimization" /> <meta name="description" content="A look at the Wordpress plugin: All in One SEO" />
These should be different for each page, after all, each page has different content, right? (If not, then you've got other things to think about) This description is often used by the search engines as the snippet about your site in the search results.
All in One SEO does this for you and gives you the ability manually over ride the settings, so you get just the information you want, where you need it.