SteemPress is a plugin for word press which can be used to connect your word press blog to the Steem blockchain. So what does that mean? Basically, if you have word press site and you use the SteemPress plugin your word press blog will automatically be posted to the Steem blockchain when you create a new blog. This allows you to expand your blogs audience, you can reach the whole steem audience whilst still being able to cater to you word press readers.
Why not check out their description of the SteemPress plugin? You can find a link below: