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A component is a kind of Joomla! 
Using Joomla!
With Joomla! You can create anything from a simple personal website to a complex ecommerce or social site with millions of visitors.
This section of the sample data provides you with a brief introduction to Joomla! concepts and reference material to help you understand how Joomla! works.
When you no longer need the sample data, you can can simply unpublish the sample data category found within each extension in the site administrator or you may completely delete each item and all of the categories.
Using Joomla!