Yoast SEO is a powerful WordPress Plugin that is actively used by millions of WordPress websites to achieve better search engine optimization results. I think it is quite safe to say that Yoast SEO is truly the number one most popular SEO Plugin for WordPress.
Yoast SEO performs a search analysis report on all of your WordPress Posts and Pages and provides you with a list of areas where you are succeeding and where you could use improvement when it comes to search engine optimization as shown in the following screenshot:
One of my favorite features of Yoast SEO is the automatic XML sitemap that it generates and appends as you add more content to your WordPress website. Unlike other WordPress Plugins, Yoast SEO appends all of your WordPress Tags to your sitemap broadening your inclusion in major search engines.