This plugin will serve requests to get photo from Gravatar server using a proxy. So, this plugin makes Your WordPress like have a system for user’s photo handling. Who is the proxy? Your domain, this plugin will uses your domain as a proxy. Example: https://secure.gravatar.com/avatar/[encoded-data-automatically-created]%3Fs=200&d=mm&r=g Will be: http://www.example.com/avatar?apid=[encoded-data-automatically-created]%3Fs=200&d=mm&r=g What is `apid`? I use apid as query variable to get photo from Gravatar, I called apid or Avatar Proxy ID to match the name of the plugin and easy to remember. So you can use and call from anywhere.