The Post-Plugin Library WordPress plugin is a workhorse, a back-end powerhouse that supercharges your website capabilities. Here, the mention of 'library' refers to a collection of functions and algorithms that many WP plugins use. Essentially, this plugin serves as a common repository of functions, augmenting WordPress's core functionality to make your plugins more efficient.

Now, you may ask, "What exactly does this plugin do?" Let's delve deeper into its functionalities. The Post-Plugin Library doesn't work independently. Instead, it serves as an ancillary system to other plugins. It makes handling extensive and complex plugins more streamlined and smooth.

When installed and activated, it aids in the process of displaying posts, managing related posts, or rendering random posts on your WordPress site. For instance, it will make it easier for other plugins to fetch and display related posts under each of your content pieces. It can determine related posts based on specified criteria, using algorithms to filter through your site's posts. This in-built intelligence allows it to accurately pick posts that are indeed contextually associated with each other.

Furthermore, the Post-Plugin Library has integrated caching mechanisms. This aspect means that the results of complex database queries performed by other plugins are stored temporarily. It saves the system from executing the same queries multiple times, so user requests can be processed much faster. This stored database not only improves speed but also significantly optimizes performance, providing a smooth user experience.

Additionally, this plugin supports many formatting options and provides a high degree of customization. Whether you want to display post summaries, post thumbnails, or tweak the layout in a particular way, this plugin facilitates it all. Essentially, it gives greater control to website administrators over how their content is displayed and interacted with.