As we have already seen in the extension manager, the Joomla! 2.5 package consists of many built-in extensions. We have already come in touch with a few of them. As a website user, you probably don't care much about the extension you are using as long as you find that it is working. As an administrator, however, you have to know exactly what is going on. We have already looked at several Joomla! extensions like the content extension, which allows you to write and manage articles as well as publish them in different ways on the website. The user extension relates to users, the category extension to categories and so on.
In the following chapters, I am going to cover the functionality of additional extensions that are part of the Joomla! core. In the Components menu, you will see Banners, Contacts, Messaging, Newsfeeds, Redirects, Search, Smart Search and Weblinks. We will have a look at these components including related modules and plugins.