Action plugins act in conjunction with :ref:`modules <working_with_modules>` to execute the actions required by playbook tasks. They usually execute automatically in the background doing prerequisite work before modules execute.
The 'normal' action plugin is used for modules that do not already have an action plugin. If necessary, you can :ref:`create custom action plugins <developing_actions>`.
You can enable a custom action plugin by either dropping it into the ``action_plugins`` directory adjacent to your play, inside a role, or by putting it in one of the action plugin directory sources configured in :ref:`ansible.cfg <ansible_configuration_settings>`.