This plugin enables you to load articles right in place where your "read more" buttons and links are.
So if you are in a Category Blog view, your users can quickly see the whole articles without reloading a the whole new page.
It's possible to enable the option to also load articles in the Catergory List view.
You can also make your own readmore buttons. If, for example, you put this code in a module:

<div>
  <p>This text stays</p>
  <div>
   <p>This text will be replaced</p>
   <div>
    <p class="readmore">
     <a href="/blog/my_article" class="btn">Your readmore button text</a>
    </p>
   </div>
  </div>
</div>

Make sure that your link is a local link starting with a "/". External links are not allowed, only local Joomla® links!

An example you can see in the module on the right, loading this article in that module. The Category Blog and Category List examples you can select from to top menu.