In principle, anyone can write a Joomla! extension, pack it according to set rules, and integrate it into the website. You will find an overview of the installed extensions in this section. When you call up the Extensions | Install/Uninstall menu item, a template appears that gives you three options for installing extensions:
Uploading of a file package
Installation from a directory
Installation by entering a URL
The Install, Components, Modules, Plugins, Templates and Languages tabs each contain listings of the installed extensions. We will cover the installation of additional components in Chapter 12.
Each of the tabs, for instance under Components, displays a list of the components that have been installed by default. You will see the version information of the component, the date of creation, and the author's information. To uninstall a component, select it and click on the Uninstall icon in the toolbar.