VK All in One Expansion Unit is a WordPress plugin that gives users an assortment of functions and options they can add to their website. Its core features include meta-boxes, custom post types, custom fields, custom taxonomy, and custom widgets.

Meta-boxes are small sections visible on the back-end of a website used to hold functions and settings. It helps to group functionality together while keeping the number of areas in the back-end of the website low. Custom post types are new areas of content that a user can create with their own set of attributes. Custom fields are additions which can be customized to each post. These fields can contain any kind of data, from text to images and video. The custom taxonomy feature helps a website organize content, allowing users to categorize and store posts correctly. Finally, the custom widget feature lets users add mini-functionalities into the sidebar or any other section of the website, such as a search or a contact form.

The plugin itself is highly customizable. It can be customized to certain users, giving them access to different functions and settings. It can also be customized to different areas of a website, setting up functions and settings to appear in specific areas. The plugin operates in both the front-end and the back-end of a website and provides users with a large library of functions and settings. It provides an extensive list of features, such as custom templates, custom users, custom roles, and custom widgets.

The plugin, however, is not limited to functions and settings. It also provides easy-to-use tools for components such as login and registration forms, commenting systems, and user ratings. Additionally, VK All in One Expansion Unit provides components to handle social media integration, such as sharing on social media and integrating social media into the discussion system.