There having lots of plugins for word press, yes you can say seo as well.
but I'm using all in one seo and sitemap both,

I'm using Yoast Wordpress SEO, it has:
- ability to edit webpage title and description per individual WP-Post or WP-page
- it has rating system that tells you what you should optimize in your post
- it has ability of inserting breadcrums into wordpress, which is really great when you have structured content on your website (this is also shown on SERP)
- it has sitemap integrated.

Here is the best I know.

-SEO Ultimate
-WP Insert
-Smart Youtube Pro
-Google Analytics
-Google XML Sitemaps
-ASKIMET
-Contact Form 7
-Popup Domination

Clickbump SEO
Love it

I use all in one SEO. I have found it to be quite effective and it has every option you could want. If you are using a premium theme that includes SEO be sure to turn it off when using any other SEO plug-in as they will conflict with each other.