System plugins operate every time a page on your site loads. They control such things as your URLS, whether users can check a «remember me» box on the login module, and whether caching is enabled.

The search component proviedes basic search functionality for the information contained in your core components. Many third party extensions also can be searched by the search component. Help

The content component (com_content) is what you use to write articles. It is extremely flexible and has the largest number of built in views. Articles can be created and edited from the front end, making content the easiest component to use to create your site content. Help