Yoast SEO Plugin ( Formerly WordPress SEO By Yoast)

We love this Plugin and it has a very well deserved reputation around the world as one of the top WordPress Plugins.
This plugin is written ” from the ground up by WordPress SEO consultant and WordPress developer Joost de Valk to improve your site’s SEO on all needed aspects”
While this WordPress SEO plugin goes the extra mile to take care of all the technical optimisation, it first and foremost helps you write better content!
WordPress SEO forces you to choose a focus keyword when you’re writing your articles, and then makes sure you use that focus keyword everywhere.
It also gives you a handy checklist in advanced ‘analysis’ to cover off essentials for SEO in your dashboard.

This plugin has had a lot of changes recently  due to hacking as well as improvements and it is HIGHLY recommended that you back your site up and update to the latest version of this great Plugin!
As at October 2015 it is Version 2.3.5
For updates, support and to check if you have the latest version Click here. (You can download it there as well.)