The Captcha plugins are used to prevent spam submissions on your forms such as registration, contact and login. You basic installation of Joomla includes one Captcha plugin which leverages the ReCaptcha® service but you may install other plugins connecting to different Captcha systems. Default on: ReCaptcha help Note: ReCaptcha is a the trademark of Google Inc. and is an independent product not associated with or endorsed by the Joomla Project. You will need to register and agree to the Terms of Service at Recaptcha.net to use this plugin. Complete instructions are available if you edit the ReCaptcha plugin in the Plugin Manager.
Content plugins run when specific kinds of pages are loaded. They do things ranging from protecting email addresses from harvesters to creating page breaks. Default on: Email Cloaking Help Load Module Help Page Break Help Page Navigation Help Vote Help Default off: Code Highlighter (GeSHi) Help
News Feeds (com_newsfeeds) provides a way to organize and present news feeds. News feeds are a way that you present information from another site on your site. For example, the joomla.org website has numerous feeds that you can incorporate on your site. You an use menus to present a single feed, a list of feeds in a category, or a list of all feed categories. Help