In short, WordPress Longtail Keyword SEO (WP LKS) is a content optimizer for your website.
In long explanation, WP LKS will help you pick the right keyword, where it will suggest you the keywords that relevant to your main keyword.
Each keyword will have:
- Monthly search volume
- Cost per click
- Competition rate
Also, inside WP LKS, you also can check your website rank on Google Search Result.