Plugins are small task oriented extensions that enhance the Joomla! framework. Some are associated with particular extensions and others, such as editors, are used across all of Joomla. Most beginning users do not need to change any of the plugins that install with Joomla. Help
The authentication plugins operate when users login to your site or administrator. The Joomla! authentication plugin is in operation by default but you can enable Gmail or LDAP or install a plugin for a different system. An example is included that may be used to create a new authentication plugin.
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.
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.