Joomla Tags, a new Joomla Core feature in Joomla 3, is a powerful way of categorizing your content.
Joomla Tags can be entered in Joomla Articles, Contacts, Newsfeeds and Weblinks.
The tags can be accessed via Menu Items and Modules, and managed via the Tags Component.
How to add Tags to Joomla Articles
Type some text and hit Enter for each tag. Click Save button at top to save all tags.
Once tags are entered they can be searched by typing the first few letters.
Click the x on the tag to remove.