See documentation - MicroKernelTrait
The Symfony MicroKernel Edition is configured with the following defaults:
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Twig is the only configured template engine;
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Doctrine ORM/DBAL is configured;
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Annotations for everything are enabled.
It comes pre-configured with the following bundles:
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FrameworkBundle - The core Symfony framework bundle
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SensioFrameworkExtraBundle - Adds several enhancements, including template and routing annotation capability
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DoctrineBundle - Adds support for the Doctrine ORM
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TwigBundle - Adds support for the Twig templating engine
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SecurityBundle - Adds security by integrating Symfony's security component
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WebProfilerBundle (in dev/test env) - Adds profiling functionality and the web debug toolbar
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SensioDistributionBundle (in dev/test env) - Adds functionality for configuring and working with Symfony distributions
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SensioGeneratorBundle (in dev/test env) - Adds code generation capabilities
Enjoy!