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It is a bit confusing to understand the difference in State API and Config API in Drupal 8. I went through the documentation of both on drupal.org but it is not clear to me yet.

Do we define both State config and Config variables in config/install directory? And How are they both distinguished?

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    State is environment-specific - the stuff you don't push around your environments. For example the last time cron ran is specific to an environment - that's state. The list of entity types available to a site is global to all instances of that site, and so is regarded as config – Clive Sep 25 '18 at 7:53
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    Clive covered it all really, but to directly answer your question, no you don't add both State and Config to the config/install directory. There are no .yml files for State values (as state is never meant to be moved between environments). Only config files go into config/install. – Jaypan Sep 26 '18 at 8:24
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Configuration is a place to store information that you want to synchronize from development to production. This information is often created during site building and is not typically generated by regular users during normal site operation.

You should use the State API, not Configuration API, for storing local variables that shouldn't travel between instances.

The State API provides a place for developers to store information about the system's state.

State information differs from configuration in the following ways:

  • It is specific to an individual environment.
  • You will never deploy to deploy it between environments.
  • You can reset a system, losing all state. Its configuration remains.

Hope that helps.

Thank you :)

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