Blocks referer/referral spam from accessing your site and cleans up your Google Analytics in the process!
CP Referrer and Conversion Tracking registers how the website visitors reached the website, identifying the referral website. Also track conversions.
When visitors is referred to your site from a search engine, the plugin is showing them related posts to their search on your blog.
Block/blacklist known (and custom) spam referring domains at the WordPress level with an HTTP 403 Forbidden page.