Joomla components are the central information in any part of the website, that is managed separately in Joomla. The components can be of different types ranging from the articles, photos, images to the video feed etc. The templates that you use decide which way and in which position the component data will be displayed in the web page. There are many third party components continuously rolling out of the Drupal programmers. To get a comprehensive list of all such components you can just check out the “components” section of the Joomla website.