System plugins operate every time a page on your site loads. They control such things as your URLS, whether users can check a "remember me" box on the login module, and whether caching is enabled. New is the redirect plugin that together with the redirect component will assist you in managing changes in URLs.
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Content plugins run when specific kinds of pages are loaded. They do things ranging from protecting email addresses from harvesters to creating page breaks.
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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.
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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.
The Quick Icon plugin group is used to provide notification that updates to Joomla! or installed extensions are available and should be applied. These notifications display on your administrator control panel, which is the page you see when you first log in to your site administrator.
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