Glossary
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Article
In Joomla! an Article is a piece of content consisting of text (HTML), possibly with links to other resources (for example, images). Articles are the basic units of information in the content system and the bottom level in the content hierarchy. Since Joomla! 2.5 
, each Article is in exactly one Category, and Categories can be in other Categories. It is also possible to have Uncategorised Articles that exist without being associated with any Category.
In Joomla! 1.5 
and earlier versions, an Article was the third level in the hierarchy Sections -> Categories -> Articles.
Articles are maintained using the Article Manager (help screen) which can be reached in the Administrator (Back-end) by clicking on the Content menu, then the Article Manager menu item.
Category
In Joomla! a Category is a collection of Articles. In Joomla! versions up to and including , is the middle level in the hierarchy Sections -> Categories -> Articles. For example, a website might have Sections called "Animals" and "Plants". Within the "Animals" Section, the website might have Categories such as "Birds" and "Mammals". Within the "Birds" Category, the website might have Articles such as "Parrots" and "Sparrows". In Joomla! versions and up, Categories can contain other Categories. The example above could be created using an "Animal" category, the Categories "Birds" and "Mammals" that are in that category, and the "Parrots" and "Sparrows" Articles in the "Birds" category.
Categories are maintained using the Category Manager (help screen) which can be reached in the Administrator (Back-end) by clicking on the Content menu, then the Category Manager menu item.
Section
In Joomla! versions up to and including , a Section is a collection of Categories. It is the top level in the hierarchy Sections -> Categories -> Articles. For example, a website might have Sections called "Animals" and "Plants". Within the "Animals" Section, the website might have Categories such as "Birds" and "Mammals".
Sections are maintained using the Section Manager (help screen) which can be reached in the Administrator (Back-end) by clicking on the Content menu, then the Section Manager menu item.
