Magento2: Registration of module

For Registering our custom module, we need to create a php file named registration.php in the root of our custom folder and write the below given code

\Magento\Framework\Component\ComponentRegistrar::register(
     \Magento\Framework\Component\ComponentRegistrar::MODULE,
     '_',
     __DIR__
 );

if examine this code then you will see that after the name of module there is a __DIR__ variable which is a php variable to identify the current working directory, it means that you can register your module from any where in Root of magento directory.

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