symfony
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+.. index::
+   single: Bundles
+
+.. _page-creation-bundles:
+
+The Bundle System
+=================
+
+A bundle is similar to a plugin in other software, but even better. The key
+difference is that *everything* is a bundle in Symfony, including both the
+core framework functionality and the code written for your application.
+Bundles are first-class citizens in Symfony. This gives you the flexibility
+to use pre-built features packaged in `third-party bundles`_ or to distribute
+your own bundles. It makes it easy to pick and choose which features to enable
+in your application and to optimize them the way you want.
+
+.. note::
+
+   While you'll learn the basics here, an entire cookbook entry is devoted
+   to the organization and best practices of :doc:`bundles </cookbook/bundles/best_practices>`.
+
+A bundle is simply a structured set of files within a directory that implement
+a single feature. You might create a BlogBundle, a ForumBundle or
+a bundle for user management (many of these exist already as open source
+bundles). Each directory contains everything related to that feature, including
+PHP files, templates, stylesheets, JavaScript files, tests and anything else.
+Every aspect of a feature exists in a bundle and every feature lives in a
+bundle.
+
+Bundles used in your applications must be enabled by registering them in
+the ``registerBundles()`` method of the ``AppKernel`` class::
+
+    // app/AppKernel.php
+    public function registerBundles()
+    {
+        $bundles = array(
+            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
+            new Symfony\Bundle\SecurityBundle\SecurityBundle(),
+            new Symfony\Bundle\TwigBundle\TwigBundle(),
+            new Symfony\Bundle\MonologBundle\MonologBundle(),
+            new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),
+            new Symfony\Bundle\DoctrineBundle\DoctrineBundle(),
+            new Symfony\Bundle\AsseticBundle\AsseticBundle(),
+            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
+            new AppBundle\AppBundle(),
+        );
+
+        if (in_array($this->getEnvironment(), array('dev', 'test'))) {
+            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
+            $bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
+            $bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();
+        }
+
+        return $bundles;
+    }
+
+With the ``registerBundles()`` method, you have total control over which bundles
+are used by your application (including the core Symfony bundles).
+
+.. tip::
+
+   A bundle can live *anywhere* as long as it can be autoloaded (via the
+   autoloader configured at ``app/autoload.php``).
+
+Creating a Bundle
+-----------------
+
+The Symfony Standard Edition comes with a handy task that creates a fully-functional
+bundle for you. Of course, creating a bundle by hand is pretty easy as well.
+
+To show you how simple the bundle system is, create a new bundle called
+AcmeTestBundle and enable it.
+
+.. tip::
+
+    The ``Acme`` portion is just a dummy name that should be replaced by
+    some "vendor" name that represents you or your organization (e.g.
+    ABCTestBundle for some company named ``ABC``).
+
+Start by creating a ``src/Acme/TestBundle/`` directory and adding a new file
+called ``AcmeTestBundle.php``::
+
+    // src/Acme/TestBundle/AcmeTestBundle.php
+    namespace Acme\TestBundle;
+
+    use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+    class AcmeTestBundle extends Bundle
+    {
+    }
+
+.. tip::
+
+   The name AcmeTestBundle follows the standard
+   :ref:`Bundle naming conventions <bundles-naming-conventions>`. You could
+   also choose to shorten the name of the bundle to simply TestBundle by naming
+   this class TestBundle (and naming the file ``TestBundle.php``).
+
+This empty class is the only piece you need to create the new bundle. Though
+commonly empty, this class is powerful and can be used to customize the behavior
+of the bundle.
+
+Now that you've created the bundle, enable it via the ``AppKernel`` class::
+
+    // app/AppKernel.php
+    public function registerBundles()
+    {
+        $bundles = array(
+            // ...
+            // register your bundle
+            new Acme\TestBundle\AcmeTestBundle(),
+        );
+        // ...
+
+        return $bundles;
+    }
+
+And while it doesn't do anything yet, AcmeTestBundle is now ready to be used.
+
+And as easy as this is, Symfony also provides a command-line interface for
+generating a basic bundle skeleton:
+
+.. code-block:: bash
+
+    $ php app/console generate:bundle --namespace=Acme/TestBundle
+
+The bundle skeleton generates a basic controller, template and routing
+resource that can be customized. You'll learn more about Symfony's command-line
+tools later.
+
+.. tip::
+
+   Whenever creating a new bundle or using a third-party bundle, always make
+   sure the bundle has been enabled in ``registerBundles()``. When using
+   the ``generate:bundle`` command, this is done for you.
+
+Bundle Directory Structure
+--------------------------
+
+The directory structure of a bundle is simple and flexible. By default, the
+bundle system follows a set of conventions that help to keep code consistent
+between all Symfony bundles. Take a look at AcmeDemoBundle, as it contains some
+of the most common elements of a bundle:
+
+``Controller/``
+    Contains the controllers of the bundle (e.g. ``RandomController.php``).
+
+``DependencyInjection/``
+    Holds certain Dependency Injection Extension classes, which may import service
+    configuration, register compiler passes or more (this directory is not
+    necessary).
+
+``Resources/config/``
+    Houses configuration, including routing configuration (e.g. ``routing.yml``).
+
+``Resources/views/``
+    Holds templates organized by controller name (e.g. ``Hello/index.html.twig``).
+
+``Resources/public/``
+    Contains web assets (images, stylesheets, etc) and is copied or symbolically
+    linked into the project ``web/`` directory via the ``assets:install`` console
+    command.
+
+``Tests/``
+    Holds all tests for the bundle.
+
+A bundle can be as small or large as the feature it implements. It contains
+only the files you need and nothing else.
+
+As you move through the book, you'll learn how to persist objects to a database,
+create and validate forms, create translations for your application, write
+tests and much more. Each of these has their own place and role within the
+bundle.
+
+_`third-party bundles`: http://knpbundles.com